Read the following passage and mark the letter A, B, C, or D on your answer sheet to in the correct word or phrase that best fits each of the numbered blanks
Singapore  has  a  highly  developed  market-based  economy,  (6)...... historically revolves around extended trade. Along with Hong Kong, South Korea and Taiwan, Singapore is one (7)......... The Four Asian Tigers. The economy depends heavily on exports , refining, imported  goods,  especially  in  manufacturing.  Manufacturing  constituted  26  (8)...... of Singapore's GDP in 2005. The manufacturing industry is well-diversified into electronics, petroleum refining, chemicals, (9).......... engineering and biomedical sciences manufacturing. In 2006. Singapore produced about 10 percent of the world’s foundry water output. Singapore is the busiest port in the world in terms of tonnage shipped. Singapore is the world's fourth largest foreign exchange trading centre after London, New York City (10)................ Tokyo.

(8)..............................

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
The term "Hudson River school" was applied to the foremost representatives of nineteenth–century North American landscape painting. Apparently unknown during the golden days of the American landscape movement, which began around 1850 and lasted until the late 1860's, the Hudson River school seems to have emerged in the 1870's as a direct result of the struggle between the old and the new generations of artists, each to assert its own style as the representative American art. The older painters, most of whom were born before 1835, practiced in a mode often self–taught and monopolized by landscape subject matter and were securely established in and fostered by the reigning American art organization, the National Academy of Design. The younger painters returning home from training in Europe worked more with figural subject matter and in a bold and impressionistic technique; their prospects for patronage in their own country were uncertain, and they sought to attract it by attaining academic recognition in New York. One of the results of the conflict between the two factions was that what in previous years had been referred to as the "American", "native", or, occasionally, "New York" school–the most representative school of American art in any genre–had by 1890 become firmly established in the minds of critics and public alike as the Hudson River school.
The sobriquet was first applied around 1879. While it was not intended as flattering, it was hardly inappropriate. The Academicians at whom it was aimed had worked and socialized in New York, the Hudson's port city, and had painted the river and its shores with varying frequency. Most important, perhaps, was that they had all maintained with a certain fidelity a manner of technique and composition consistent with those of America's first popular landscape artist, Thomas Cole, who built a career painting the Catskill Mountain scenery bordering the Hudson River. A possible implication in the term applied to the group of landscapists was that many of them had, like Cole, lived on or near the banks of the Hudson. Further, the river had long served as the principal route to other sketching grounds favored by the Academicians, particularly the Adirondacks and the mountains of Vermont and New Hampshire.

What does the passage mainly discuss?

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.
When John Mills was going to fly in an airplane for the first time, he was frightened. He did not like the idea of being thousands of feet up in the air. "I also didn't like the fact that I wouldn't  be in control," says John.
"I'm a terrible passenger in the car. When somebody else is driving, I tell them what to so. It drives everybody crazy."
However John couldn't avoid flying any longer. It was the only way he could visit his grandchildren in Canada.
"I had made up my mind that I was going to do it, I couldn't let my son, his wife and their three children travel all the way here to visit me. It would be so expensive for them and I know Tom's business isn't doing so well at the moment - it would also be tiring for the children - it's a nine-hour flight!" he says.
To get ready for the flight John did lots of reading about airplanes. When he booked his seat, he was told that he would be flying on a Boeing 747, which is better known as a jumbo jet. "I  needed to know as much as possible before getting in that plane. I suppose it was a way of making myself feel better. The Boeing 747 is the largest passenger aircraft in the world at the moment.
The first one flew on February 9th 1969 in the USA. It can carry up to 524 passengers and 3.400 pieces of luggage. The fuel for airplanes is kept in the wings and the 747's wings are so big that they can carry enough fuel for an average car to be able to travel 16,000 kilometers a year for 70 years. Isn't that unbelievable? Even though I had discovered all this very interesting information about the jumbo, when I saw it for the first time, just before I was going to travel to Canada, I still couldn't believe that something so enormous was going to get up in the air and fly. I was even more impressed when I saw how big it was inside with hundreds of people!"
The biggest surprise of all for John was the flight itself. "The take-off itself was much smoother than I expected although I was still quite scared until we were in the air. In the end, I managed to relax, enjoy the food and watch one of the movies and the view from the window was spectacular. I even managed to sleep for a while!
"Of course," continues John, "the best reward of all was when I arrived in Canada and saw my son and his family, particularly my beautiful grandchildren. Suddenly, I felt so silly about all the years when I couldn't even think of getting on a plane. I had let my fear of living stop me from seeing the people I love most in the world. I can visit my son and family as often as I like now!" 

Why did John Mills fly in an airplane?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks
There has been an outbreak of avian influenza, better known as bird flu in Asia recently. The first (1)............ died two weeks ago in Vietnam and there have been the cases reported since in Thailand, and there are some suspected cases in Cambodia as well as.
Wild birds are affected by a large number of flu viruses, just as the humans and other animals are, but they are normally exclusive to birds. If the viruses manage to mutate, they can to jump the species barrier and infect human beings. The first case (2)......... someone died was in Hong Kong in 1997.
There are the several different forms of bird flu, ranging from mild to very (3).............. infections, which spreading rapidly and kill many of the birds they infect. It is spread by wild birds-ducks, in particular – which carry the virus, but aren't killed by it. They can spread the virus to farm birds through (4).............contact or by the contaminating water supplies.
World Health Organization officials have attributed the spread of bird flu to human contact with the droppings of infected birds and (5)........... sanitation. There was no evidence at first that the virus spread from person to person, though there has been a case of this happening being investigated by scientists.

(1)...............................

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
As the twentieth century began, the importance of formal education in the United States increased. The frontier had mostly disappeared and by 1910 most Americans lived in towns and cities. Industrialization and the bureaucratization of economic life combined with a new emphasis upon credentials and expertise to make schooling increasingly important for economic and social mobility. Increasingly, too, schools were viewed as the most important means of integrating immigrants into American society.
The arrival of a great wave of southern and eastern European immigrants at the turn of the century coincided with and contributed to an enormous expansion of formal schooling. By 1920 schooling to age fourteen or beyond was compulsory in most states, and the school year was greatly lengthened. Kindergartens, vacation schools, extracurricular activities, and vocational education and counseling extended the influence of public schools over the lives of students, many of whom in the larger industrial cities were the children of immigrants. Classes for adult immigrants were sponsored by public schools, corporations, unions, churches, settlement houses, and other agencies.
Reformers early in the twentieth century suggested that education programs should suit the needs of specific populations. Immigrant women were once such population. Schools tried to educate young women so they could occupy productive places in the urban industrial economy, and one place many educators considered appropriate for women was the home.
Although looking after the house and family was familiar to immigrant women, American education gave homemaking a new definition. In preindustrial economies, homemaking had meant the production as well as the consumption of goods, and it commonly included income-producing activities both inside and outside the home, in the highly industrialized early-twentieth-century United States, however, overproduction rather than scarcity was becoming a problem. Thus, the ideal American homemaker was viewed as a consumer rather than a producer. Schools trained women to be consumer homemakers cooking, shopping, decorating, and caring for children "efficiently" in their own homes, or if economic necessity demanded, as employees in the homes of others. Subsequent reforms have made these notions seem quite out-of-date.A

All of the following statements are true EXCEPT .

Choose the best answer:
The tsunami in 2011 caused a massive ________ to Japan.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.
When John Mills was going to fly in an airplane for the first time, he was frightened. He did not like the idea of being thousands of feet up in the air. "I also didn't like the fact that I wouldn't  be in control," says John.
"I'm a terrible passenger in the car. When somebody else is driving, I tell them what to so. It drives everybody crazy."
However John couldn't avoid flying any longer. It was the only way he could visit his grandchildren in Canada.
"I had made up my mind that I was going to do it, I couldn't let my son, his wife and their three children travel all the way here to visit me. It would be so expensive for them and I know Tom's business isn't doing so well at the moment - it would also be tiring for the children - it's a nine-hour flight!" he says.
To get ready for the flight John did lots of reading about airplanes. When he booked his seat, he was told that he would be flying on a Boeing 747, which is better known as a jumbo jet. "I  needed to know as much as possible before getting in that plane. I suppose it was a way of making myself feel better. The Boeing 747 is the largest passenger aircraft in the world at the moment.
The first one flew on February 9th 1969 in the USA. It can carry up to 524 passengers and 3.400 pieces of luggage. The fuel for airplanes is kept in the wings and the 747's wings are so big that they can carry enough fuel for an average car to be able to travel 16,000 kilometers a year for 70 years. Isn't that unbelievable? Even though I had discovered all this very interesting information about the jumbo, when I saw it for the first time, just before I was going to travel to Canada, I still couldn't believe that something so enormous was going to get up in the air and fly. I was even more impressed when I saw how big it was inside with hundreds of people!"
The biggest surprise of all for John was the flight itself. "The take-off itself was much smoother than I expected although I was still quite scared until we were in the air. In the end, I managed to relax, enjoy the food and watch one of the movies and the view from the window was spectacular. I even managed to sleep for a while!
"Of course," continues John, "the best reward of all was when I arrived in Canada and saw my son and his family, particularly my beautiful grandchildren. Suddenly, I felt so silly about all the years when I couldn't even think of getting on a plane. I had let my fear of living stop me from seeing the people I love most in the world. I can visit my son and family as often as I like now!" Question 24: Why did John Mills fly in an airplane?

How did John feel when the airplane was taking off?

(May 2) – Automotive-manufacturing company Lybera, Inc., today announced that Harvey Ramirez has been appointed as the new chairperson of its board of directors. He ---135--- Helen McGavick, who has resigned in order to pursue a new business venture.
“We thank Ms. McGavick for her service and wish her success in her ---136--- endeavors,” said Fen Wang, Lybera’s president, and CEO.
Mr. Ramirez has spent ten years as CEO of aerospace-engineering firm Elia Aviation.---137---, he held a variety of senior management roles across public and private sectors.“Mr. Ramirez’s familiarity with sophisticated technology, combined with his leadership experience, makes him well suited to lead our company,” said Mr. Wang. “ 138---.”

137....................

For the last three years we have charged the same wholesale prices for our baked goods, including cakes, pies, cookies, and brownies. We regret that sharply rising prices for our raw ingredients, such as sugar and fruit, have forced us to raise our prices by 5 percent ---135--- August 1. We have made every attempt to avoid this price increase. ---136---, we refuse to compromise on the quality of our products. Using the best ingredients available will allow us to provide the delicious desserts your restaurant guests have come to expect. -------137---.We appreciate your ---138--- and look forward to continuing to serve you.

138................

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks.
These days, most people in Britain and the US do not (1)........ very formal clothes. But sometimes it is important to wear the right thing.
Many British people don't think (2)........... clothes very much. They just like to be comfortable. When they go out to enjoy themselves, they can wear almost anything. At theatres, cinemas and concerts you can put on (3).............. you like from elegant suits and dresses to jeans and sweaters. Anything goes, as long as you (4)......... clean and tidy.
But in Britain, as well as in the US, men in offices usually wear suits and ties, and women wear dresses or skirts (not trousers). Doctors, lawyers and business people wear quite formal clothes. And in (5)............hotels and restaurants men have to wear ties and women wear smart dresses.
(5)...........................................

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks
Someone once has said that there are three kinds of people who are interested in sport: People who (39)...... part, people who watch, and people who watch (40).............. television. It’s very easy to make fun of stay-at-home sports fans but on the other hand, television does enable us to enjoy all kinds of (41).......... events. We can watch a racing car overtake another, see a cyclist cross the finishing line, or enjoy the goals of our favorite football (42)............. The first time I watched a tennis match was on television, and I found it unexpectedly interesting. It’s not always easy to travel long distance to football grounds and television is a good solution. Of course, you can  (43)..........used to sitting indoors all the time, and this is dangerous. We should all try to keep fit, and have other interests and pastimes

(43)...............................

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
In 1826, a Frenchman named Niépce needed pictures for his business. He was not a good artist, so he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph.
The next important date in the history of photography was 1837. That year, Daguerre, another Frenchman, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything clearly, even the smallest details. This kind of photograph was called a daguerreotype.
Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities, and mountains.
In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple and photographers had to carry lots of film and processing equipment. However, this did not stop photographers, especially in the United States. After 1840, daguerreotype artists were popular in most cities.
Matthew Brady was one well-known American photographer. He took many portraits of famous people. The portraits were unusual because they were lifelike and full of personality. Brady was also the first person to take pictures of a war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.
In the 1880s, new inventions began to change photography. Photographers could buy film ready- made in rolls, instead of having to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later. They did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive. With a small camera, anyone could be a photographer. People began to use cameras just for fun.
They took pictures of their families, friends, and favorite places. They called these pictures "snapshots".
Documentary photographs became popular in newspapers in the 1890s. Soon magazines and books also used them. These pictures showed true events and people. They were much more real than drawings.
Some people began to think of photography as a form of art. They thought that photographycould do more than show the real world. It could also show ideas and feelings, like other art forms.

The first photograph was taken with     .

Choose the best answer to complete the passage.

Twenty (1)________ ago, kids in school had never even heard of the internet. Now, I'll bet you can't find a single person in your school who hasn't at least heard of it. In fact, many of us use it on a regular basis and even have access to it from our homes! The 'net' in internet really stands (3) _________ network. A (2) __________  is two or more computers connected together so that information can be (4) __________, or sent from one computer to another. The internet is a vast resource for all types of information. You may enjoy using it to do research for a school project, downloading your favourite songs or communicating with friends and family. Information is accessed through web pages (5) _________ companies, organizations and individuals create and post. It's kind of like a giant bulletin board that the whole world uses! But since anyone can put anything on the internet, you also have to be careful and use your best judgement and a little common sense.

Just because you read something on a piece of paper someone sticks on a bulletin board doesn't mean it's good information, or even correct, for that matter. So you have to be sure that whoever posted the information knows what they're talking about, especially if you're doing (6) ___________! But what if you're just emailing people? You still have to be very careful. If you've never met the person that you're communicating with online, you could be on dangerous ground! You should never give out any personal information to someone you don't know, not even your name! And just like you can't believe the information on every website out there, you can't rely (7) ________ what strangers you 'meet' on the internet tell you either. Just like you could make up things about yourself to tell someone, someone else could do the same to you!

(1)________

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks
Water is necessary for life. People can live only a few days (44)........  it. Yet nearly 25 million   people die each year because of it. Both industrial nations and less-developed countries are worried about the (45).................... and quantity of water in the world.
Even though people, animals, agriculture, and industry use a lot of water, there is more than enough on the Earth. Water covers about three-fourths of the Earth's surface. However, 97.4 percent of it is salt water. Three-fourths of the Earth's fresh water is frozen in glaciers and in the great polar ice caps. Most of the water we use (46)................     from rivers, lakes, and the atmosphere. Less than one percent of the Earth's water is usable, and we use it over and over again.
One of the (47)......... about water is distribution. Water is not always distributed where the large (48)..........centers are. Some regions get enough rain, but it is all in one or two short rainy seasons.
(45)................................

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions:
Facebook users spend an average of more than 15 hours a month on the social networking site. While there are plenty who caution against such intensive use — and there are a number of studies detailing the harm Facebook could potentially cause — there also are lots of reports extolling the site's virtues. As the social media giant prepares for its upcoming initial public offering, here are some ways Facebook just might be good for you.
Spending time on Facebook can help people relax, slow down their heart rate and decrease stress levels, according to researchers from the Massachusetts Institute of Technology and the University of Milan. In a study published earlier this year, researchers studied 30 students and  found that a natural high was sparked when they were on  the  social media network that led  to  the relaxed heart rates and lower levels of stress and tension. In the study, the students were monitored in three situations: looking at panoramic landscapes, performing complicated mathematical equations and using Facebook. While the first situation was the most relaxing to students and the math problems were the most stressful, the time on Facebook uncovered high levels of attractiveness and arousal. The findings support the researchers' hypothesis that Facebook's success, as well as that of other social media networks, correlates to the specific positive mental and physical state users experience.
While many may argue that social media networks only distract employees, research shows  the opposite may be true. Research from Keas.com found that a 10-minute Facebook break makes employees happier, healthier and more productive. The study examined workers in three groups: one that was allowed no  breaks, one that was allowed to do  anything but use the Internet and one  that was allowed 10 minutes to use the Internet and Facebook. The Facebook group was found to be 16 percent more productive than the group that was not allowed to use the Internet and nearly 40 percent more productive than the group that was allowed no breaks. "Short and unobtrusive breaks, such as a quick surf on the Internet, enables the mind to rest itself, leading to a higher net total concentration for a day's work, and as a result, increased productivity," said Brent Coker of the department of management and marketing at the University of Melbourne in Australia.
Facebook is also in the business of matchmaking. Research shows that nearly 60 percent of singles will friend someone new on Facebook after meeting them in  person. If  they like what they see, 25 percent are likely to contact their new love interest via Facebook. Once the courting is over, nearly 40 percent of those social networking adults will update their relationship status on Facebook, with just 24 percent telling their friends first. Facebook use between couples will continue through the dating process, the research shows. Throughout the day, 79 percent of  couples  said they send partners Facebook messages or chat on the social network. In addition, more than 60 percent would post romantic messages on their significant other's Facebook wall. When the relationship ends, more than half of those surveyed immediately update their status to single, which automatically sends out a notification to their friend list to start the dating cycle over again.

The word "sparked" in the second paragraph probably means    _.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
Generally, in order to be preserved in the fossil record, organisms must possess hard body parts such as shells or bones. Soft, fleshy structures are quickly destroyed by predators or decayed by bacteria. Even hard parts left on the surface for any length of time will be destroyed, therefore, organisms must be buried rapidly to escape destruction by the elements and to be protected against agents of weathering and erosion. Marine organisms thus are better candidates for fossilization than those living on the land because the ocean is typical the site of sedimentation, whereas the land is largely the site of erosion. The beds of ancient lakes were also excellent sites for rapid burial of skeletal remains of freshwater organisms and skeletons of other animals, including those of early humans, Ancient swaps were  particularly plentiful with prolific growths of vegetation, which fossilized in abundance. Many animals became trapped in bogs overgrown by vegetation. The environment of the swaps kept bacterial decay to a minimum, which greatly aided in the preservation of plants and animals. The rapidly accumulating sediments in flood plains, deltas, and stream channels buried freshwater organisms, along with other plants and animals that happened to fall into the water.
Only a small traction of all the organisms that have ever lived are preserved as fossils. Normally, the remains of a plant or animal are completely destroyed through predation and decay. Although it seems that fossilization is common for some organisms, for others it is almost impossible. For the most part of, the remains of organisms are recycled in the earth, which is fortunate because otherwise soil and water would soon became depleted of essential nutrients. Also, most of the fossils exposed on Earth’s surface are destroyed by weathering processes. This make for an incomplete fossil record with poor or no representation of certain species. The best fossils are those composed of that form the vast majority of
unaltered fossils. Calcite and aragonite also contributed to a substantial number of fossils of certain organisms.

Why does the author mention “aragonite” in the last line?

We appreciate your feedback regarding Medusa Airways’ flight 859, which was scheduled to depart at 9:35 A.M. on 19 February. We are sorry that this flight ---139---. We have decided to compensate you for the---140---. We have refunded the unused portion of your ticket, valued at $410. Also, we will reimburse the $200 you paid in hotel charges resulting  ---141---  the disruption.---142---. 

141...................

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks
Everyone needs a home where they feel sheltered and safe. Today we live in modern flats and houses, (1)........ have air-conditioning to keep us cool, and heating to keep us warm. There is electricity for lighting and supplies of gas or oil for the heating. Hot and cold water (2)........ from the taps and dirty water disappears (3)...........the drains. Many of our homes have balconies or gardens. In the past, people made their homes from materials that they found nearby. When we look at different houses we can tell how old they are from the materials used and the way they were built. It was different long (4)........ people did not have water in their homes and there were no electric lights. To keep warm, they sometimes made (5)..............inside their homes. With a fire started they could cook their food and heat water

(4)...........................

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
The progressive movement was a powerful and broad-based movement of reform that had lasting effects on the American political system in the first two decades of the twentieth century. It arose in reaction to the domination of the social and political system by business interests and rampant corruption throughout the political party system during the period following the end of the Civil War in 1865. Progressivism emerged as a force during the presidency of Theodore Roosevelt, from 1901 to 1909, and reached its height in the presidential campaign of 1912. By the time the United States entered World War I in 1917, progressivism as a force had faded from the political scene. The progressive movement was focused on instigating, or initiating change in three different areas. One area that was of major interest to the progressive movement was the imposition of legal and government control over big business, which had usurped an extraordinary amount of power in the era of the wealthy industrial barons such as Rockefeller and Carnegie. A second area of interest to the progressive movement was the improvement of the social system in order to rid society of the poverty, slum housing, and exploitation of immigrant and child labor that were a part of the era. A final area of interest was the cleaning up of the political system to move political decisions back into the realm of direct democratic control and away from the corrupt backroom deals that plagued the world of politics.
Progressivism was a grassroots movement that first gained force at the local level. In cities such as Cincinnati and Cleveland, effective urban reform movements took hold, and city officials were appointed or elected to run their respective cities along nonpartisan lines and out from under the control of political parties and bosses. The progressive movement then worked its way from the local level to the state level and then on to the national level. In the state of Wisconsin, for example, "Fighting Bob" La Follette led the drive for change, first in his role as governor of the state (1901-1906) and later as the U.S. senator representing the state (1906-1925). Under his leadership, numerous reforms were instituted: state regulation of the railroads increased, policies directed at improving the lives of workers -- such as workers' compensation and unemployment insurance -- were instituted, and in the political arena, selection of party candidates was determined by direct democratic vote rather than through backroom political wrangling.

It can be inferred from the passage that the progressive movement strongly influenced the American political system for .

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks
Water is necessary for life. People can live only a few days (44)........  it. Yet nearly 25 million   people die each year because of it. Both industrial nations and less-developed countries are worried about the (45).................... and quantity of water in the world.
Even though people, animals, agriculture, and industry use a lot of water, there is more than enough on the Earth. Water covers about three-fourths of the Earth's surface. However, 97.4 percent of it is salt water. Three-fourths of the Earth's fresh water is frozen in glaciers and in the great polar ice caps. Most of the water we use (46)................     from rivers, lakes, and the atmosphere. Less than one percent of the Earth's water is usable, and we use it over and over again.
One of the (47)......... about water is distribution. Water is not always distributed where the large (48)..........centers are. Some regions get enough rain, but it is all in one or two short rainy seasons.
(47)................................

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.
Global warming is the current increase in temperature of the Earth’s surface (both land and water) as well as its atmosphere. Average temperature around the world have risen by 0.75°C (1.4°F) (1)....... the last 100 years. About two thirds of this increase has occured since 1975 in the past, when the Earth experienced increases in temperature it was the result of natural causes, but today it is being caused by accumulation of greenhouse gases in the atmosphere produced by human(2)........... .
The natural greenhouse effect maintains the Earth’s temperature at a safe level making it (3)...............for humans and many other life forms to exist. However, since The Industrial Revolution what benefits human has significantly enhanced the greenhouse effect (4)............ the Earth’s average temperature to rise by almost 1°C. This is creating the global warming (5)..............we see today

(1)......................................