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In the 1960s, it took pop and rock groups one or two days to record other their songs. Nowadays, it can take months and months. Many rock groups begin by recording only one instrument, for example, the voice. Then they record (1)________ instruments – electric piano, synthesizer, guitars, drums and so on. Next, they might use a computer to add special effects. Finally, they ‘mix’ all the instruments until they get the sound that they want. This means that a CD or cassette will always sound very different from a (2) ______ concert. Music engineers have developed a new computer programme that will change the future of music. A computer can analyze a singer’s voice. Then if you give the computer the (3)_________ and music of a song, the computer can ‘sing’ it in that voice. This means that a singer only needs to record one song and the computer can then sing other songs in the singer’s own voice. Singers can sing new songs many years after they have died. Most of us listen to music for pleasure, but for the record companies, music is a product, the same as soap powder. (4)___________ a record company finds a new group (or ‘band’), they first try to develop the band’s ‘profile’. They will try to create an ‘image’ for the band that they think will attract young people. Instead of allowing the band’s full artistic freedom, they will often (5)_______ the band what they should wear, what they should say and how they should sing and play. In recent year, many rock groups have started their own record companies because they say that the big companies are too commercial

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Where smart cities were once regarded purely as a vision of the future, they are now  becoming a reality in numerous urban centres across the globe. From Dubai, Singapore, Amsterdam, Copenhagen, and Madrid to Southampton in the UK, we’re already beginning to see smart cities provide inhabitants with improved living conditions, easier mobility and cleaner, safer environments, by using cloud computing to power services. But as with all public sector initiatives, smart city services need to be delivered as cost effectively as possible to minimise the taxpayer burden. Often, key decision makers are met with obstacles when it comes to deploying smart services, preventing smart cities initiatives from reaching their full potential – or worse, blocking them altogether.  Central to the functioning of most ‘normal’ city ecosystems is the underlying data they run on. Regardless as to whether that data is stored on local servers or using cloud storage, when that data is fragmented or incomplete, identifying emerging trends for strategic planning and cost reduction becomes extremely difficult – and because of this, authorities have to adopt an entirely reactive approach. Conversely, in a smart city environment, connected sensors forming an Internet of Things (IoT) provide valuable data for analysis and, in turn, insight into the specific city’s behavioural trends. With this level of information, services can be optimised to reduce costs and risk, increase urban flows and manage assets. Importantly, they can also provide real-time connections and interactions between the city’s businesses, local governments, service providers and citizens.  In this way, operations and services are elevated through the integration and connection of physical devices via IoT networks, ultimately transforming how a city runs. 
1. Which best serves as the title for the passage?

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Fairy tales are the stories that adults, especially parents, tell young children. In view of their name, it is surprising that hardly any of them are actually about fairies. (33) ________ most fairy tales have happy endings, the stories usually deal with very (34) ________ situations - children abandoned in the forest, terrifying giants, cruel stepmothers. However, despite being scared when they are told the stories, children will often ask to hear them over and over again. Many psychologists believe that what fairy tales do, in addition to (35) ________ children's  imagination, is to show that there are problems in the world and they can be overcome. Just like adults, children have fears and worries: theirs are of things such as abandonment, loss, injuries, witches. Fairy tales present real problems in a fantasy form (36) ________ children are able to understand. This, it is claimed, allow them to (37) ________ their fears and to realise, if ever in their unconscious mind, that no matter how difficult the circumstances, there are always ways of coping

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When you first arrive in a foreign culture, often your first reaction is completely positive. Everything seems exciting, different and fascinating. It’s an (1) ______. If you are just on a short holiday, you will probably never leave this phase. (2) ______, if you stay longer, your attitude can start to change. As you start to realize (3) ______ little you really understand the new culture, life can get frustrating. People misunderstand what you are trying to say, or they may laugh at you when you say something incorrectly. Even simple things, like posting a letter, can seem very difficult to you. Thus, you are likely to get angry or upset when things go wrong. With time, though, you start to (4) ______ to become more comfortable with the differences and better able to handle frustrating situations. Your (5) ______ of humor reappears. Finally, you may feel enthusiastic about the culture once again, enjoy living in it, and even prefer certain aspects of the culture to your own.

Read the passage carefully and choose the correct answer.

Communication in general is process of sending and receiving messages that enables humans to share knowledge, attitudes, and skills. Although we usually identify communication with speech, communication is composed of two dimensions - verbal and nonverbal. Nonverbal communication has been defined as communication without words. It includes apparent behaviors such as facial expressions, eyes, touching, tone of voice, as well as less obvious messages such as dress, posture and spatial distance between two or more people. Activity or inactivity, words or silence all have message value: they influence others and these others, in turn, respond to these communications and thus they are communicating. Commonly, nonverbal communication is learned shortly after birth and practiced and refined throughout a person's lifetime. Children first learn nonverbal expressions by watching and imitating, much as they learn verbal skills. Young children know far more than they can verbalize and are generally more adept at reading nonverbal cues than adults are because of their limited verbal skills and their recent reliance on the nonverbal to communicate. As children develop verbal skills, nonverbal channels of communication do not cease to exist although become entwined in the total communication process.

We can learn from the text that ________.

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The International Ecotourism Society (TIES), a non-profit organization committed to promoting sustainable tourism, states that ecotourism unites conservation and communities with sustainable travel. With that being said, they offer six core principles of ecotourism that vacationers should follow: minimize impact, build environmental and cultural awareness and respect, provide positive experiences for both visitors and hosts, provide direct financial benefits for conservation, provide financial benefits and empowerment for local people, and raise sensitivity to host countries’ political, environmental, and social climate. Ecotourism offers the opportunity to help protect and maintain our planet. Beginning with responsible travel, sustainable tourism promotes green practices such as recycling and using organic products. There are also many environmental programs and initiatives made available so that people can get involved with sustainability. For example, in Kenya, tourists can get involved with the Basecamp Foundation, which has a monitoring program for big cats and elephants. These kinds of experiences try to demonstrate the positive impact of tourism and teach tourists about the significance of maintaining the environment. However, the simple act of being a tourist in a fragile, natural area helps a great deal, as the money spent there assists in raising funds to protect those areas for generations. Sustainable tourism supports local communities by allowing their economy to grow. Tourism alone employs a large number of local staff. This in turn empowers communities to fight against poverty and encourages the support of local events, festivals, and organizations. As a result the community and its local businesses thrive.  Not only is ecotourism an environmentally fun experience, but it’s also educational. By embarking on an ecotourism vacation, people gain an awareness and understanding of the social and economic conditions of the place they visit. In addition, vacationers learn to appreciate the area’s environment through conservation and also to respect the culture of the local people. While tourists are normally unaware of a country’s poverty or ill conditions, ecotourism strives to expose tourists to the realities of these areas. Ecotourism is a new holiday experience that mixes together vacation fun with conservation and education. Sustainable tourism creates environmentally aware individuals and helps develop their appreciation of nature and local culture. Not only do vacationers go home with new knowledge, but also a worthwhile experience.  
7. Which of the following statements is TRUE, according to the passage?

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Many people in Britain and the US belong to at least one club or society. Club is often used to (1) _______ to a group of people who regularly meet together socially or take part in sports. Most young people’s groups are called clubs. A society is usually concerned (2) _____ a special interest, e.g. birdwatching or local history. National societies, such as the Royal Society for the Protection of Birds, usually have local branches. Social clubs have a bar where members can sit and talk to each other. Member of the upper class or business people may belong to a gentlemen’s club. Most of (3) ______ are in London and even today only some of them allow women to be members. They are places to relax in, (4) _______also to make business contracts and take clients. Some clubs combine social events with community service. Members of the Rotary Club and the Lions Club are usually (5) ______or business people. In the US, these organizations are called service clubs. Some are open only to men. They hold events to raise money for good causes, e.g. to provide scholarships for university students or to raise money for a hospital

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Children can learn a lot from doing household chores. Doing chores helps children learn about (1)___________ they need to do to care for themselves, a home and a family. They learn skills they can use in their adult lives, like preparing meals, cleaning, organizing and keeping a garden. (2)________in chores also gives children experience of relationship skills like communicating clearly, negotiating, cooperating and working as a team. When children (3)_________ to family life, it helps them feel competent and responsible. Even if they don’t enjoy the chore, when they keep going they get the feeling of satisfaction that comes with finishing a task. And sharing housework can also help families work better and reduce family stress. When children help out, chores get done sooner, and parents have less to do. This frees up time for the family to spend doing fun things together. The secret for involving children in household chores is asking for contributions that you (4)__________ and that suit your children’s ages and abilities. A chore that’s too hard for a child can be frustrating – or even dangerous – and one that’s too easy might be boring. Even a young child can start to help out if you choose activities that are right for his age. You can start with simple jobs like looking after his own toys. Chores like this send the message to your child that his contribution is important. If your child is old enough, you can have a family discussion (5)___________ chores. This can reinforce the idea that the whole family contributes to how the household runs

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Last week, China declared “mission accomplished” after landing a spacecraft, Chang’e-4, on the far side of the Moon. It was a remarkable endeavour. As the far side of the Moon never faces the Earth, mission control cannot communicate directly with the spacecraft, but only via an orbiting satellite. The terrain is more broken and cratered than the near side, so landing a craft is that much more difficult. Even Nasa was impressed: “a first for humanity and an impressive accomplishment!”. Yet mixed with admiration was trepidation. China, a latecomer to the space race, is now beginning to threaten the supremacy of America and Russia. But then Russia and America have long played their space exploration programmes for propaganda purposes. From the beginning, the space race was intimately bound up with the needs of the cold war. In 1957, the Soviet Union launched Sputnik, the first human craft to orbit the Earth. Four years later, Yuri Gagarin became the first man in space. Eight years later, on 21 July 1969, Neil Armstrong and Buzz Aldrin became the first humans to tread on the Moon. Their journey may have been fuelled in part by cold war desperation, but it was also an extraordinary triumph of knowledge and will, an act of the technological sublime. Once America was satisfied that the Soviet Union had been put in its place, space exploration became politically less important. As America downgraded its space ambitions, Chinese aspirations took flight. In 1992, the Chinese government approved the Shenzhou manned spaceflight programme. Eleven years later, Yang Liwei became the first Chinese astronaut in space. Fears about Chinese ambitions have been heightened by the changing context of the space race. During the cold war, America feared the Soviet Union, but was determined to thwart Moscow’s aims. Today, American apprehension stems from the worry that China’s emergence as the dominant global force cannot be checked, nor Beijing’s brutal despotism challenged. As liberal democracy frays in the west and authoritarian capitalism becomes entrenched in the east, self-doubt shapes US attitudes to China. Space exploration has long been fuelled by a mixture of humanistic dreams, technological leaps and tawdry politics. The Chang’e-4 mission is no different. How the space race will play out over the next decade, and what role China will adopt in global politics, remains uncertain. In the meantime, let us celebrate our new perspective of the dark side of the Moon.
4. The word “it” in paragraph 3 refers to _____

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We find that bright children are rarely held back by mixed- ability teaching. On the contrary, both their knowledge and experience are enriched. We feel that there are many disadvantages in streaming pupils. It does not take into account the fact that children develop at different rates. It can have a bad effect on both the bright and the not-so-bright child. After all, it can be quite discouraging to be at the bottom of the top grade! Besides, it is rather unreal to grade people just according to their intellectual ability. This is only one aspect of their total personality. We are concerned to develop the abilities of all our pupils to the full, not just their academic ability. We also value personal qualities and social skills, and we find that mixed- ability teaching contributes to all these aspects of learning. In our classrooms, we work in various ways. The pupils often work in groups; this gives them the opportunity to learn to co-operate, to share, and to develop leadership skills. They also learn how to cope with personal problems as well as learning how to think, to make decisions, to analyze and evaluate, and to communicate effectively. The pupils learn from each other as well as from the teachers. Sometimes the pupils work in pairs; sometimes they work on individual tasks and assignments; and they can do this at their own speed. They also have some formal class teaching when this is appropriate. We encourage our pupils to use the library, and we teach them the skills they need in order to do this effectively. An advanced pupil can do advanced work; it does not matter what age the child is. We expect our pupils to do their best, not their least, and we give them every encouragement to attain this goal.
9. According to the passage, "streaming pupils" ......

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Traditional media come from the people and antecede the mass media; their appeal has historically been both functional and aesthetic. Whether of roughly hewn folk origins or of classifically rigid moulds, they have always served to entertain, educate to reinforce existing ideas or ideologies or to change existing values and attitudes. In other words, it is a means of changing values, attitudes and norms in order to provide a proper climate for social and economic progress. It is also a method of promoting certain behavioural acts or patterns. The aim is to get people to perform specific acts to achieve objectives of national policy (e.g. visiting clinics, investing in bonds, using fertilizer). Moreover, it is a channel for conveying information about available techniques and facilities which people may use to solve problems. Being close to people at the local level, these channels are potentially useful in the service of social concerns, as determined by local, provincial or national authorities themselves. They are, moreover, abundantly present in areas where mass media technology has not been fully or effectively developed to capture sustained interest at local, provincial or national levels. Folk media are personal forms of entertainment and communication. This is important because behavioural changes are most easily brought about by personal interaction. These forms of art are a part of the way of life of a community and provide acceptable means of bringing development issues into the community in its own-terms. They are capable of reaching intimate social groups, thus making use of already established communication networks in the audience. 
2. What purpose of traditional media is NOT mentioned?

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Naturalists in the developed countries were largely split between conservationists and  preservationists. This battle is no better demonstrated in the US than during the Progressive Era of 1890-1920.  While the existing economic paradigm was one of laissez-faire economics that many felt was damaging the natural environment and integrity of natural resources, the conservationist movement led by Theodore Roosevelt was deeply concerned about the wastage and harm it was doing to the land, leading to a large number of game species in the US on the brink of extinction in less than a century. Then there were the preservationists who argued that the proposals of the emerging conservationists did not go far enough. This was certainly the view of John Muir who believed that there was still too much concern for the economic value of land rather than the need for preservation of pristine landscapes. Muir’s Sierra Club made a stand with the development of the Hetch Hetchy Dam in Yosemite, arguing that the land should be kept pristine and the valley protected.  As president, Roosevelt pushed strongly for conservation issues which may be the reason they eventually won the day. During his term in office, around 230m acres of land were put under Federal protection, established the US Forestry Service, and created five national parks, and several national forests. That’s not to say that preservationists did not have their victories. In the 1960s, the Wilderness Actset aside large tracts of land with minimal human impact and of particular cultural, scientific, or natural interest. In these areas, logging, mining and other industrial activities are prohibited and there are strong protections in place to maintain the integrity of natural water sources partly for the ecosystem and partly for industrial and commercial developments downstream of the water flow. 
4. The word “it” in paragraph 2 refers to _______

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In today’s fast-paced industry, learning will most likely involve seeking new skills in ways that challenge the norm. But thankfully, there is a promise for such lifelong learning online - the promise that will save your time and money while helping you earn more of both. Provided you have access to a decent computer and the Internet, the barrier to getting started is probably lower than it ever has been. And with those things in place, it is a matter of finding the content you wish to learn. So, to help others who may be looking to maximize their own learning efforts, I have listed some quick tips below. First, set achievable goals. When you start learning, it is a good idea to set goals about what you want to learn or what you might do with your newly acquired knowledge. It might be landing that new job, building a tangible product, or impressing your current management. The goals may vary in size and complexity, but do revisit these goals throughout your learning process. Within a couple weeks, ask yourself: “Am I getting closer to my goal?” or “Am I learning the skills necessary to reach my goals?”. If you are not, then you may need to look elsewhere. Second, learn with others. By yourself, learning anything has a high propensity to become frustrating. Try teaming up with friends or colleagues. They can often be your best resource for maintaining motivation while you learn. Third, make it a habit. Online habits often include scrolling through social media or watching videos on YouTube. If you have the downtime for such activities, then you could spend that downtime learning something. And why not learn something? If you do, then you will have plenty more to talk about on social media anyways. So, make learning your new online habit by making a commitment to learn something new each day. 
2. What does the word “both” in paragraph 1 refer to?

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Whether a species is endangered—meaning at risk of extinction—depends on which definition you use. The International Union for Conservation of Nature’s Red List of Threatened Species classifies an animal as endangered when its numbers in the wild have dropped so low that it’s at “extremely high risk” of extinction. Meanwhile, the United States’ Endangered Species Act of 1973 takes into consideration any destruction to a species’ habitat, whether it has been over-consumed, any disease or predation that threaten it, whether any other man-made factors put it in danger, and what policies currently exist to protect it. When members of the public or a state agency propose to the U.S. Fish & Wildlife Service or the National Marine Fisheries Service that a species be listed as endangered under the law, research and management plans are formed to help those species survive. It is illegal under the Endangered Species Act to capture, hunt, shoot, or otherwise harm an animal that’s listed as endangered. Sometimes, federal agencies decide that although a species could be considered endangered, other species are higher priorities. In those cases, the animal or plant gets limited protections. One animal whose numbers have increased through conservation is the bald eagle. There were only about 500 bald eagles in the continental United States in the 1960s because of pesticides that damaged the shells of their eggs. Conservation efforts including captive breeding programs, habitat protection, and a ban on the insecticide DDT helped the bald eagle’s numbers soar back into the thousands. Another is the giant panda, which was declared no longer endangered in 2016 thanks to 50 years of efforts to save it. U.S. Rep. John Dingell, who wrote the Endangered Species Act, argued that “only natural extinction is part of natural order.” Scientists believe that 227 species - including the grizzly bear, the peregrine falcon and the gray wolf - were saved from extinction in the first 33 years of the law’s existence. Still, critics argue that the act is expensive and ineffective because it protects so many species. Several federal courts have heard and rejected arguments that the Endangered Species Act is unconstitutional, and members of Congress have tried to weaken the law in small ways.
5. The word “it” in paragraph 3 refers to _____

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While trust in media as a whole may be at an all-time low, a new study by the EBU has shown the public’s trust in traditional media (broadcast and the written press) is actually on the rise. However, people’s trust in new media continues to fall: 61% of European countries distrust the internet while 97% have no faith in social networks. The EBU’s new report – Trust in Media 2018 – shows the figures illustrating the differences between people’s trust in traditional and new media. Broadcast media remain the most trusted forms of media with 59% of people tending to trust radio (equivalent to 2017) and 51% trusting TV in the EU (an increase of 1 percentage point on 2017). Trust in the written press has also slowly improved over the last 5 years and it is now trusted by 47% of EU citizens. At the same time, people’s trust in the internet and social media has been eroded by fake news, misinformation and disinformation. Only 34% of EU citizens trust the internet and a mere 20% now trust social networks (down from 36% and 21% respectively in 2017). Trust in Media 2018 is based on data published in the 88th Eurobarometer survey and gives an idea of European citizens’ perception of the trustworthiness of different types of media. The survey consists of approximately 1000 face-to-face interviews in the 33 countries covered by the study. The report shows how European citizens’ trust in broadcast media is closely connected with a free and independent press. The higher the level of trust in a country’s radio and TV, the higher press freedom in that country tends to be. There are also strong regional differences with the Nordics and Albania tending to trust traditional media the most while Eastern Europeans tend to trust social networks and the internet more. The EBU’s Head of Strategy and the Media Intelligence Service Roberto Suárez Candel said: “The results of our research show that good quality, impartial media is highly valued by the public. “Public service media play an important role in that and, together, our Members make an invaluable contribution to society. The role of our public service Members in upholding democratic values and supporting media freedom is clearly demonstrated by the results of our research.”  
5. According to paragraph 3, all the statements can be supported by the research, EXCEPT ____

Each sentence has a mistake. Find it bychosing A B C or D

With so many choices of wireless technology available, it is often difficulty to determine which offers the best value and quality

Choose the best answer:
Unemployment rate is high. This makes many children move back to their parents' house.

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The climate crisis is poised to deliver a severe blow to America’s most threatened animals, with a new study finding that almost every species considered endangered is vulnerable in some way to global heating. Of the 459 animal species listed as endangered by the US government, researchers found that all but one, or 99.8%, have characteristics that will make it difficult for them to adapt to rising temperatures. The California condor, once close to being completely wiped out, faces increased risk of contamination in hotter conditions. Key deer, found only in the Florida Keys, face losing habitat to the rising seas. Whole classes of animals including amphibians, mollusks and arthropods are sensitive to the greatest number of climate-related threats, such as changes in water quality, shifting seasons and harmful invasive species that move in as temperatures climb. Mammals, such as the north Atlantic right whale and Florida panther, also face increased hardships, albeit on fewer fronts than amphibians, mollusks and arthropods.  Despite the overwhelming peril faced by America’s endangered species due to the climate crisis, the report, published in Nature Climate Change, found a patchy response from the US government. Federal agencies consider just 64% of endangered species to be threatened by the climate crisis, while just 18% of listed species have protection plans in place. Astrid Caldas, a study co-author and a climate scientist at the Union of Concerned Scientists said: “While agencies have increasingly listed climate change as a growing threat to species whose survival is already precarious, many have not translated this concern into tangible actions, meaning a significant protection gap still exists.” Nearly half of Australian species are threatened by the climate crisis, researchers have found. A spokesman for the US Fish and Wildlife Service, which oversees the endangered species list, said that while a species may be sensitive to changes in the climate, this sensitivity may not be so severe as to warrant being put on the list. “Our process for determining this looks at five factors: threats to a species’ habitat, overutilization, disease or predation, existing regulatory mechanisms, and other factors that may affect its continued existence,” he said. “Through this scientifically rigorous process we examine and account for the effects of climate change.  
5. The word “mechanisms” in paragraph 4 is closest in meaning to _______

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Saving the planet is very much in vogue. It’s also in Harper’s Bazaar, Elle and Mademoiselle. It’s the message on fashion runways, in marketing strategies, in jewelry and accessory designs, on shopping bags and totes, in advertisements and on price tags. A naked fashion model wearing a hat of birch branches and lichen, as shown in Vogue this month, may not be everyone’s idea of environmental awareness. But the pervasiveness of ecological themes in the images and marketing of fashion is undeniable. It is also somewhat paradoxical. The fashion industry, whose driving philosophy involves encouraging consumers to discard the old and embrace the new, is now trying to push itself to the forefront of efforts to conserve and preserve. The environmental theme in fashion began as wispy touches and graphic exhortations in designer collections, not as some well-thought-out strategy of “green” marketing in which the environmental advantages of a product become part of the sales approach. Tendrils of ivy dangled from the ceiling at a Paris fashion show; a carpet of grass covered a runway in New York; models marched along in T-shirts or carrying signs all bearing slogans like “Clean Up or Die,” “Save the Sphere,” and “Environmental Protection Agents”.  The environmental spin on fashion has now moved into the mass market, where ‘’clothes with conscience’‘ make an extra tug at the buyer’s self-image. Bonjour, a jeans and sportswear company based in New York, has embarked on a program to ’‘change the individual’s outlook toward saving the environment’’ through educational tags. This summer, the first wave of what Bonjour executives said would be 50 million fashion items a year are to arrive in stores carrying tags with environmental tips from how to save water to how to reduce pollutants. Whether these tributes to nature will benefit the environment or even raise environmental awareness, with concomitant changes in individual behavior, is not clear. There is some skepticism. Professor Ewen says the new environmental symbolism should be viewed as part of an overall change in America’s economy, from one built on industrial production of hard goods to one based on “pure representation”. “Going back to fashion, the environment has become a commercial cliche separated from real concerns. What can be attached to this year’s fashion is merely the symbolism of environmental sanity.” 
3. According to paragraph 2, why is the green effort of fashion world so much of an irony?

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While light at night can be beneficial, neutral, or damaging for individual species, its presence invariably disturbs ecosystems. For example, some species of spiders avoid lit areas, while other species are happy to build their spider web directly on a lamp post. Since lamp posts attract many flying insects, the spiders that don’t mind light gain an advantage over the spiders that avoid it. Light pollution poses a serious threat in particular to nocturnal wildlife, having negative impacts on plant and animal physiology. It can confuse animal navigation, alter competitive interactions, change predator-prey relations, and cause physiological harm. The rhythm of life is orchestrated by the natural patterns of light and dark, so disruption to these patterns impacts the ecological dynamics. Studies suggest that light pollution around lakes prevents zooplankton, such as Daphnia, from eating surface algae, causing algal blooms that can kill off the lakes’ plants and lower water quality. Light pollution may also affect ecosystems in other ways. For example, scientists have documented that night time light may interfere with the ability of moths and other nocturnal insects to navigate. Night-blooming flowers that depend on moths for pollination may be affected by night lighting, as there is no replacement pollinator that would not be affected by the artificial light. This can lead to species decline of plants that are unable to reproduce, and change an area’s long term ecology. Reducing light pollution implies many things, such as reducing sky glow, reducing glare, reducing light trespass, and reducing clutter. The method for best reducing light pollution, therefore, depends on exactly what the problem is in any given instance. Adjusting the type of lights used, so that the light waves emitted are those that are likely to cause severe light pollution problems  
5. The writer’s tone in the passage is __________________

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Light-emitting diodes (LEDs) are now considered the future of lighting due to a lower energy requirement to run, a lower monthly price tag, and a longer life than traditional incandescent light bulbs. Nick Holonyak, an American scientist at General Electric, accidently invented the red LED light while trying to create a laser in the early 1960s. As with other inventors, the principle that some semiconductors glowed when an electric current was applied had been known since the early 1900s, but Holonyak was the first to patent it for use as a light fixture. Within a few years, yellow and green LEDs were added to the mix and used in several applications including indicator lights, calculator displays, and traffic lights, according to the DOE. The blue LED was created in the early 1990s by Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura, a group of Japanese and American scientists, and for which they won the 2014 Nobel Prize in Physics. The blue LED allowed scientists to create white LED light bulbs by coating the diodes with phosphor Today, lighting choices have expanded and people can choose different types of light bulbs, including compact fluorescent (CFL) bulbs work by heating a gas that produces ultraviolet light and LED bulbs. Several lighting companies are pushing the boundaries of what light bulbs can do, including Phillips and Stack. Phillips is one of several companies that have created wireless light bulbs that can be controlled via smartphone app. The Phillips Hue uses LED technology that can quickly be turned on or off or dimmed by a flick on a smart phone screen and can also be programmed. The higher-end Hue light bulbs can even be set to a large range of colors (only about sixteen million) and synced with music, movies, and video games. Stack, begun by engineers from Tesla and NASA, developed a smart light bulb using LED technology with a wide range of functions. It can automatically sense the ambient lighting and adjust as needed, it turns off and on via motion sensor when someone enters the room, can be used as a wake up alert, and even adjusts color throughout the day to fit with human’s natural circadian cycles and patterns of natural light. The light bulbs also have a built-in learning program that adapts to inputs given by residents over time. And all of these functions can be programmed or monitored from any smart phone or tablet. It is estimated that Stack smart light bulbs can use about sixty percent less energy than a typical LED light bulb and lasts between twenty and thirty thousand hours depending on the model . These light bulbs are compatible (or soon will be) with many of the options for turning an entire home into a smart home including usage with Amazon Alexa, Google Home, and Apple HomeKit.
3. According to paragraph 3, white LED light bulbs _____