The teacher told Joe _____

(223)_____

The ability to conduct electricity is one of the key properties of a metal. Other solid material such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what are known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together.

An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the 'lead' of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow.

Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor or electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive.

According to the passage, a metal can conduct electricity due to________.

Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
Language is the normal way humans communicate. Human language has syntax, a set of rules for connecting words together to make statements and questions. Language can also be changed, by adding new words, for example, to describe new things. Other animals may (1)________ a set of calls which their predecessors have left. Language may be done by speech or by writing or by moving the hands to make (2) ________. It follows that language is not just any way of communicating. Even some human communication is not a language, like (3) _________ language for example. Chinese is the language with the most native speakers in the world, but Chinese is not really a language. It is a close family of dialects, some of (4) ________ are as different as Romance languages are from one another. English is often called "the international language", or lingua franca. It is the main second language of the world and the international language of science, travel, technology, business, diplomacy, and entertainment. French had a similar (5) _________ until the 20th century, and other languages had it at other times

Read the following passage and choose the best answer (A, B, C, D):
Thanks to our modern lifestyle, with more and more time spent sitting down in front of computers than ever before, the number of overweight people is at a new high. As people frantically search for a solution to this problem, they often try some of the popular fad diets being offered. Many people see fad diets as innocuous ways of losing weight, and they are grateful to have them. Unfortunately, not only don't fad diets usually do the trick, they can actually be dangerous for your health. Although permanent weight loss is the goal, fewareabletoachieveit. Expertsestimate that 95 percent of dieters return to their starting weight, or even add weight. While the reckless use of fad diets can bring some initial results, long-term results are very rare. Nonetheless, people who are fed up with the difficulties of changing their eating habits often turn to fad diets. Rather than being moderate, fad diets involve extreme dietary changes. They advise eating only one type of food, or they prohibit other types of foods entirely. This results in a situation where a person's body doesn't get all the vitamins and other things that it needs to stay healthy. One popular fad diet recommends eating lots of meat and animal products, while nearly eliminating carbohydrates. A scientific study from Britain found that this diet is very high in fat. According to the study, the increase of damaging fats in the blood can lead to heart disease and, in extreme cases, kidney failure. Furthermore, diets that are too low in carbohydrates can cause the body to use its own muscle for energy. The less muscle you have, the less food you use up, and the result is slower weight loss. Veteran dieters may well ask at this point, "What is the ideal diet?" Well, to some extent, it depends on the individual. A United States government agency has determined that to change your eating habits requires changing your psychology of eating, and everyone has a different psychology. That being said, the British study quoted above recommends a diet that is high in carbohydrates and high in fiber, with portions of fatty foods kept low. According to the study, such a diet is the best for people who want to stay healthy, lose weight, and keep that weight off. And, any dieting program is best undertaken with a doctor's supervision.
7. According to the passage, what diet does a British study recommend?

Choose the best answer:
Aware of her disability, Anna makes great __________ to study the alphabet.

Read the passage below carefully, and then choose the best answer:
In 1971, Sue Coppard worked as a secretary in London. While she enjoyed city life, Sue also missed the countryside where she spent most of her time as a child. So she offered to help out on a farm, or more specifically, an organic farming programme organized by a nearby college. She got a few people to volunteer as well, and they spent the weekend doing “housework,” which involved clearing bushes and cleaning drains. Afterwards, the farm managers said they could come back anytime to help out. Sue put a small ad in a magazine, offering people the chance to volunteer at the organic farm. The volunteer programme grew quickly, and soon other organic farmers joined in, asking for people to help out. With so many people and farms involved, someone needed to organize the different groups. A few of the original volunteers started WWOOF (World Wide Opportunities on Organic Farms) to help volunteers and farmers find one another. Today, at least 50 different countries have WWOOF organizations, and many other countries have individual farms that participate in the movement. While WWOOF is still a weekend activity for some, it now welcomes travellers and people who visit to live and work on farms for longer periods of time. WWOOF volunteers can stay on a farm for weeks or even months at a time in exchange for hands-on farming and gardening experience. The work can be exhausting, but volunteers think it’s worth it. By working on farms, the volunteers interact with farmers and develop a love for the outdoors and organic farming. Many travellers now use WWOOFing as a way to visit new countries and experience new cultures. As travellers will discover, every WWOOF opportunity is a bit different. In Serbia, you can find Misa and Olja, a couple whose farm is known for its hard cheeses and for its bread made from homegrown grains. Finca Amiruca, a farm in Ecuador, teaches volunteers how to grow peanuts, plantains, and yucca. When volunteering in Japan, you may get to learn about growing rice. WWOOF is only one of the many unique volunteer opportunities available. Volunteering is something that anyone can do, and a wide variety of organizations accept or even welcome volunteers. So the next time you get the itch to be active on the weekend or on vacation, why not look for a good cause to spend your energy on?

1. Why did Sue first work on a farm?

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid removes minerals from tooth enamel, allowing tooth decay to begin; the saliva in your mouth encourages remineralization and neutralizes the acid. The rate at which bacteria in the mouth produce acid depends on the amount of plaque on the teeth, the composition of the microbial flora, and whether the bacteria of the plaque have been "primed" by frequent exposure to sugar. To keep your teeth healthy, a regular dental hygiene program should be followed.
Removing plaque with a toothbrush and dental floss temporarily reduces the numbers of bacteria in the mouth and thus reduces tooth decay. It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions. If fluoride is present in drinking water when teeth are forming, some fluoride is incorporated into the enamel of the teeth, making them more resistant to attack by acid. Fluoride toothpaste seems to act in another way, by promoting the remineralization of early carious lesions.
In addition to a regular dental hygiene program, a good way to keep your teeth healthy is to reduce your intake of sweet food. The least cavity-causing way to eat sweets is to have them with meals and not between. The number of times you eat sweets rather than the total amount determines how much harmful acid the bacteria in your saliva produce. But the amount of sweets influences the quality of your saliva. Avoid, if you can, sticky sweets that stay in your mouth a long time. Also try to brush and floss your teeth after eating sugary foods. Even rinsing your mouth with water is effective. Whenever possible, eat foods with fiber, such as raw carrot sticks, apples, celery sticks, etc., that scrape off plaque, acting as a toothbrush. Cavities can be greatly reduced if these rules are followed when eating sweets.

The word "scrape off" is closest in meaning to

 Her job was so_____ that she decided to quit it.

(259)_______

Choose the best answer:
'Could you please wait here until your name is called?'

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the best option for each of the following questions.
Banana fiber is used in the production of banana paper. Banana paper is used in two different senses: to (1)..................... to a paper made from the bark of the banana tree, mainly used for artistic purposes, or paper made from banana’s fiber, (2).............. from an industrialized process, from the stem and the non–usable fruits. The paper can be either hand–made or made by machine. The volume of raw (3)................... for making banana paper around the world on plantations is vast and largely unutilized. The market for banana paper is seen as a growth industry. (4).......... 1988, in Costa Rica, companies like EcoPaper.com   and   Costa   Rica   Natural   Paper   have   been   producing   100%   industrialized   fine environmental and ecological paper derived from natural banana fibers, for the writing and stationery market.
This industry (5).......... numerous waste products such as: the plastic that wraps the bananas, plastic cords to tie the wrapping, damaged bananas and the pinzote (stems). An alarming quantity of over of 92% of water, 3% of resins and 2% glucose; the rest is vegetal fiber. This particular composition  makes it decompose without the solid component being destroyed. This causes a severe impact on the surrounding ecosystems – much to the detriment of rivers and underground waters.

(2).....................

Read the passage below carefully, and then choose the best answer:
Putting Cars on Autopilot
Automobile accidents are one of the leading causes of death each year. Accidents can occur due to drunk driving, mechanical problems, carelessness, or a whole assortment of other reasons. In the near future, these problems could be solved by eliminating the person behind the wheel. Driverless cars may soon be turning all vehicle owners into “backseat drivers”. Driverless cars are vehicles that use several technologies to operate without human input. Through GPS, they can find a location on a map and plan the best route to get there. They may also use radar to detect other vehicles and avoid them when necessary. One company involved with developing driverless cars is Google. It’s developing a software called Google Chauffer which powers the vehicles. The technology isn’t cheap though, as Google robotic cars contain about $150,000 worth of equipment. In 2012, Google began testing the cars on the road with a highly-skilled driver in the driver’s seat, and a Google engineer in the passenger seat. In case there are any malfunctions, the human driver can step on the brakes or turn the wheel to take control of the automobile. Other car manufacturers are also working on implementing automated options into their cars. For example, the 2014 Mercedes-S class offers advanced cruise control using radar, lane warnings, and even detects, and warns drivers when they appear tired. Many Americans seem open to the idea, as three states have already passed laws that make it legal for driverless cars to be on the road. Still there will be some stumbling blocks to overcome before the roads are controlled by digital decision-makers. Firstly, companies will need to provide proof that driverless cars were tested a lot and are truly safe. Automobile manufacturers will also have to find a way to bring down costs, as few people would be able to afford the equipment required. Driverless cars could also potentially become targets for computer hackers. If a hacker were somehow able to override the software system, they could cause accidents or malfunctions. There are also economic issues to consider. If driverless cars became successful, millions of truck, bus, and taxi drivers would likely lose their jobs. Despite these issues, all indications suggest that it should be just a matter of time before humans are no longer needed behind the wheel.
8. The word “malfunction” in paragraph 3 is closest in meaning to _________

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 bestfits each of the numbered blanks.
           WOMEN TAKING THE HUSBAND’S NAME
Many women in Western society, aware of the power of names to influence identity, are aware that choosing how to identify themselves after marriage can be a significant decision. They may follow the tradition of taking their husband's last name, hyphenate their (1)........     name and their husband's, or keep  their birth name. One fascinating survey reveals that a woman's choice is (2)........   to reveal a great deal   about herself and her relationship with her husband. Women who take their husband's name place the most importance (3).......... relationships. On the other hand, women who keep their birth names put their personal concerns ahead of relationships and social expectations. Female forms of address influence others' perceptions as well. Research (4)...........in the late 1980s showed that women who choose the title Ms. give the impression of being more achievement oriented, socially self-confident, and dynamic but less interpersonally warm than counterparts (5)........ prefer the more traditional forms Miss or Mrs.

(2).....................

Read the passage below carefully, and then choose the best answer:
The LED Lighting Revolution
If you have picked up any electronics magazines recently, you have probably heard about LEDs; yet chances are, you probably don’t realize why they are so special. The truth is that these tiny light bulbs are helping to improve watches, remote controls, televisions, and a host of other projects. Diodes are components that enable energy to flow in one direction, while simultaneously blocking the current from the opposite direction. This is similar to how a valve works on a faucet. If electronic manufacturers require currents to flow in several directions, then multiple diodes will be included in the circuit design. With LEDs, every time a current passes through them, a light is emitted. LED is short for light-emitting diode. Although they have only recently waves in the past decade or so, early models have been around since 1962. There are several benefits that LEDs offer when compared to incandescent or fluorescent lighting. For starters, they have extremely long-life spans in the range of l00,000 hours even in the toughest conditions. They also require far less energy than power sources, which can save users money over the long run. Since LEDs don’t contain moving parts like other bulbs, they can withstand heavy impacts without getting damaged. Finally, they don’t require any _warm-up time_ so they instantly light up when switched on. The only drawback is that they are still a more expensive to purchase at the moment. LEDs were first used on digital clocks, but they have come a long way since then. They have certainly done a lot to improve TV technology. LED TVs have been a hit because they can be built extremely thin, yet also offer power-saving benefits. LED TVs also provide a wider range of colour, which allows for more lifelike and vivid images. In the future, organic LEDs, or OLEDs, will bring additional benefits for viewers. OLEDs are even more flexible than LEDs, so manufacturers will be able to create bent display screens and lights. Therefore, you will be able to roll up your living room TV set and pack it in your suitcase. In other words, LED and OLED technology will likely be lighting up your life for years to come.
1. When energy goes through an LED, it _________

Read the passage carefully and choose the correct answer

I was born to dance. I've been dancing all my life, ever since my mother, who gave up a dancing career on the stage when she married my father, picked me up and twirled me around as an infant. As much as I loved dancing with her, her greatest gift to me was her “unconditional love” during her lifetime.

My parents divorced after only 5 years of marriage, but my father remarried a lovely lady who also loved to dance. They used to take me to a dancing club where I would listen to the music and watch them dance-occasionally my step-mother, Mary, invited me to dance.

I also met my wife, Charlotte, in a dancing party. I danced with her for about 15 minutes, and during that brief span, I realized that I fell in love with her. We kept dancing throughout our marriage. My earliest memories of dancing with my daughters started when I came home from work to our small home in Marblehead, Massachusetts, and my daughter Laura was about 3 years old. It was very relaxing for me to turn on the record player, pick up Laura in my arms, and dance her around the room!

Our family danced a lot. My daughters, Laura and Anne, and I continued to dance on every occasion. One favorite memory I have of dancing with Laura and Anne was when I took each of them when they were seniors in high school to the Daddy-Daughter dance. We won both dance competitions!

As their father, I have tried to provide my daughters with unconditional love, as my Mother provided to me, endless emotional and loving support, and good educations and life experiences which have helped prepare them for happy and successful adult lives. Being a father who is worthy of their love and respect, I consider fatherhood a privilege, not an entitlement.

In 1994, my oldest daughter Laura gave me a lovely book, which I still have, entitled “Fathers and Daughters.” My Father’s Day suggestion to every father is to dance with your daughters at every opportunity. It will not only bring you closer, it will give them memories of you “to hang onto” long after we are gone.

The writer _____ fatherhood.

 Water polo balls _____ with a special texture so it will not slip from the hands of a player.

(419)________

Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.:
 The sculpture represents the biblical King David. It was carved in the early 1500s.

Read the passage below carefully, and then choose the best answer:
Space Debris
Once something is considered rubbish, we want to throw it away and forget about it. Yet if we are not careful about where we store it, our garbage could come back to haunt us. On the Earth, poorly discarded garbage can cause land, water, and air pollution. And now, people are starting to learn that space debris can also cause a host of different problems. Space debris is defined as a collection of objects that orbit the Earth. Space debris can be classified into two categories. One is man-made rubbish, such as old satellites, rockets, and other machinery left in space after past missions. The other is natural objects, such as meteors that are traveling through space. If you think the man-made garbage doesn’t amount to much, guess again. Researchers estimate that there are over 20,000 pieces of large debris floating around in space and approximately 300,000 smaller pieces in orbit as well. Traveling at speeds of up to 17,500 miles per hour, these objects create a great degree of danger for any spaceships when they leave or return to the Earth. We are lucky to some degree that there haven’t been too many accidents caused by space debris as of yet. Still some incidents have occurred. In 1996, a French satellite was damaged after it crashed into debris from an old French rocket. Then in 2009, an old Russian satellite collided with a working US satellite. The end result was an additional 2,000 pieces of space junk that was added to the junk pile. As the current situation can only worsen, it is now up to the international community to cooperate and create a plan to deal with space debris. For starters, several nations have pledged to take more care with the items they discard in space to cut down on future debris. Researchers are working on devising a way to label space junk, so it can be avoided. Others have proposed more creative techniques to recapture the garbage and discard it on the Earth, or destroy it with lasers. The nightmare scenario that everyone fears is if the Kessler Syndrome starts to occur. This is when the density of garbage becomes so high that it sets off a chain reaction of collisions which would raise the probability of accidents even further. Although there is not a long-term solution in place for space debris, nations are starting to understand the seriousness of this problem.
6. What best summarizes the current situation regarding space garbage?

 In most _______ developed countries, up to 50% of _____ population enters higher education at some time in their lives. 

(233)____

Choose the best answer:

 Her outgoing character contrasts ______ with that of her sister.

Read the following passage and choose the best answer for each blank.

FAMILY HISTORY

In an age when technology is developing faster than ever before, many people are being (21) _____to the idea of looking back into the past. One way they can do this is by investigating their own family history. They can try to (22) _____out more about where their family came from and what they did. This is now a fast-growing hobby, especial in countries with a (23) _____ short history, like Australia and the United States.

It is (24) _____thing to spend some time (25) _____through a book on family history and to take the (26) _____to investigate your own family’s past. It is (27) _____another to carry out the research work successfully. It is easy to set about it in a disorganised way and (28) _____yourself many problems which could have been (29) _____with a little forward planning.

If your own family stories tell you that you are (30) _____with a famous character, whether hero or criminal, do not let this idea take over your research. Just treat it as an interesting possibility. A simple system for  collecting and storing your path. The most important thing, though, is to get started. Who knows what you might find?

(26) _____

Those letters _____ now. You can do the typing later.

(393)______