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.

The atoms of a metal can bond together because________.

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Lan used to go to school _________.

Choose the letter A, B, C or D to complete the sentences with given words
He/ be/ creative, patient/ and/ have/ great love/ children

Food critics from two ---131--- newspapers, the Toronto Day and Toronto Rising are expected to dine here this week. Let's make a special effort to do our work flawlessly. Photographs of the critics will be placed at our welcome station. Using these ---132---, hosts will be responsible for identifying the critics and telling the wait staff, who should alert the kitchen. Servers must strive to be prompt. They should also recommend our daily specials. ---133---. I am confident that everyone ---134--- these critics with our great food and service.

132................

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They are going ____________ Halong Bay in this summer vacation.

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He does not know much about the project but he is very ______.

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My parents had always planned to open a restaurant, but it ________ to nothing.

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"What happened to the old mail carrier?"

"He_____ to a new neighborhood to work".

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The valley is so dangerous to live in.

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 more and more people concentrate in cities, planners are looking for ways to (1) _______ cities into better living spaces. This can be (2) _______ by improving existing infrastructure while also creating more public spaces that are both beautiful and green. This can be hard to accomplish, especially in cities with a haphazard fashion. Some cities have been created with the idea of a green city as the goal. One such city, Masdar City in the United Arab Emirates, aims to become a (3) _______ . for other cities to follow. It is being known as a truly green city that relies strictly on renewable sources such as solar energy to provide all of its energy needs. In addition, it will be a zero waste city in which (4) _______ that is used can be recycled. (5) _______ it will truly accomplish its goal remains to be seen, but it will also act as an experiment for environmentally-friendly areas to be tested.

Choose the best answer:
How much is a washing machine?

Well need more staff _____ we start the new project.

(246)_____

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Instead of _______about the good news, Tom seemed to be indifferent.

 Choose the best answer:
By the end of last summer, Alexander _______ his Ph.D.

 Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage:

"Men are lazy in the home, according to an official survey (1)……… today. They have about six hours a week more free time than wives, but play very little(2)…… in cooking, cleaning, washing, and ironing, according to the Social Trends Survey by the Central (3)…… Office.
 Nearly three quarters of married women (4)…… to do all or most of the housework, and among married men the proportion who admitted that their wives did all or most of the housework was only slightly lower.
 The survey (5)…… that washing and ironing was the least popular task among men, with only one percent (6)…… this duty, compared with 89 percent of women, and 10 percent sharing equally.
 Only 5 percent of men (7)….. the evening meal, 3 percent carry out household cleaning duties, 5 percent household shopping, and 17 percent wash the evening dishes. But when household gadgets break down, (8)……  are carried out by 82 percent of husbands.
 The survey says that, despite our economic problems, the majority of Britons are substantially better (9)….. than a decade ago. We’re healthier, too - eating healthier foods and smoking less.
 The (10)…..  Briton, not surprisingly, is more widely travelled than a decade ago. More people are going abroad for holidays, with Spain the favorite destination."

8. But when household gadgets break down, (8)……  are carried out by 82 percent of husbands.

Read the passage below carefully, and then choose the best answer:
Will Shortz: Puzzle Maker
When you ask a child what they would like to be when they grow up, common responses might include firefighter, pilot, doctor, or athlete. But those jobs don’t capture the attention of all kids. Take Will Shortz, for example. In eighth grade, at the age of 14, Shortz had to write an essay about what he wanted to do with his life. He wrote about his desire to become a puzzle maker – someone who creates games and puzzles, such as sudoku or crossword puzzles. That same year, he sold his first puzzle to the magazine Venture. By the age of 16, Shortz was regularly contributing puzzles to magazines. In college, Shortz found that there was no traditional way to study puzzles or become a puzzle maker. There were no classes offered on puzzles. Fortunately, after becoming bored with his economics studies, Shortz learned that his university offered a special programme that allowed students to suggest and create unique fields of study. After creating and completing two courses on word and math puzzles, Shortz switched his major to enigmatology – the study of puzzles. Shortz and his professors then created new classes that explored all aspects of puzzle-making. He studied the history, construction, and psychology of puzzles, mostly on his own. Because there were no professors of enigmatology, Shortz realized that he probably was the only student at his university to know more about his field than any of his professors. He did well in school, but upon graduating, Shortz did not know how to get a job creating puzzles. For summer work, he joined the magazine Penny Press, where he realized that he could find work as a puzzle editor. Shortz then found a job creating and editing puzzles for Games magazine. This seemed like a dream job because he could create new kinds of puzzles and be surrounded by great puzzle makers. After 15 years at Games, Shortz accepted a position as the editor of The New York Times’ crossword puzzle. When he first joined, the newspaper’s crossword puzzle was seen as very difficult, and few readers could complete it. Shortz made fundamental changes, such as including everyday language in the clues and answers so that many more people could enjoy it. Today, he credited with making the crossword appealing to a wider audience. Some of Shortz’s most famous puzzles have related to the news for that day, such as the name of the winning president on Election Day, and a love-themed puzzle on Valentine’s Day.
6. Why did Will Shortz consider his job at Games magazine a “dream job”?

Choose the best answer:
Could you/ show/ me/ way/ cinema, please?

There will be powerful network of computers which may come from a single ______computing that is worn on or in the body. 

(311)_____

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 more and more people concentrate in cities, planners are looking for ways to (1) _______ cities into better living spaces. This can be (2) _______ by improving existing infrastructure while also creating more public spaces that are both beautiful and green. This can be hard to accomplish, especially in cities with a haphazard fashion. Some cities have been created with the idea of a green city as the goal. One such city, Masdar City in the United Arab Emirates, aims to become a (3) _______ . for other cities to follow. It is being known as a truly green city that relies strictly on renewable sources such as solar energy to provide all of its energy needs. In addition, it will be a zero waste city in which (4) _______ that is used can be recycled. (5) _______ it will truly accomplish its goal remains to be seen, but it will also act as an experiment for environmentally-friendly areas to be tested.

Read the passage below carefully, and then choose the best answer:
A Microchip in Your Body
In 1998, a British scientist named Kevin Warwick did an experiment. He inserted a small microchip into his left arm. He used the microchip to turn on lights, work with his computer, and even start the water for his hath. After only nine days, Warwick removed the microchip from his arm. Nine days is not a long time, but it was enough to give the world a very important message. It is possible to have a microchip in your body. Many people think that someday, we all will have microchips. There are all kinds of things that a microchip could do. It could be useful for simple, everyday things. You might not have to carry keys, because you could use your microchip to open the front door of your house. You might not need cash, because you could use your microchip to buy things. A microchip might be able to do more important things. For example, a microchip could contain all of your important health information. If you had an emergency and wert to hospital, doctors could read your microchip and learn all of your health history. Some scientists even believe that someday a microchip could help cure diseases. Many people dislike the idea of a microchip in their body. They have a lot of concerns. Is it safe? Could a microchip make you sick? Besides, would other people be able to read your microchip and steal your personal information? People are especially worried about personal freedom. This is probably the biggest reason why so many people are against these microchips. What if your government could use your microchip to watch you? What if your government could use your microchip to find your location? Do you want the government to have that information about you? Again, for most people the answer is “no". Nobody has microchips in their body yet. We don't know if this will ever happen. If we ever do have microchips, we don't know what they would look like or what they would do. What do you think? Would you like to have a microchip inserted into your body?
4. What is the biggest concern that people have about the microchips?

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 lack of printing regulations and the unenforceability of British copyright law in the American colonies made it possible for colonial printers occasionally to act as publishers. Although they rarely undertook major publishing project because it was difficult to sell books as cheaply as they could be imported from Europe, printers in Philadelphia did publish work that required only small amounts of capital, paper, and type. Broadsides could be published with minimal financial risk. Consisting of only one sheet of paper and requiring small amounts of type, broadsides involved lower investments of capital than longer works. Furthermore, the broadside format lent itself to subjects of high, if temporary, interest, enabling them to meet with ready sale. If the broadside printer would know this immediately, there would be no agonizing wait with large amounts of capital tied up, books gathering dust on the shelves, and creditors impatient for payment.
In addition to broadsides, book and pamphlets, consisting mainly of political tracts, catechisms, primers, and chapbooks were relatively inexpensive to print and to buy. Chapbook were pamphlet-sized books, usually containing popular tales, ballads, poems, short plays, and jokes, small, both in formal and number of pages, they were generally bound simply, in boards (a form of cardboard) or merely stitched in paper wrappers (a sewn antecedent of modern-day paperbacks). Pamphlets and chapbooks did not require fine paper or a great deal of type to produce they could thus be printed in large, cost-effective editions and sold cheaply.
By far, the most appealing publishing investments were to be found in small books that had proven to be steady sellers, providing a reasonably reliable source of income for the publisher. They would not, by nature, be highly topical or political, as such publications would prove of fleeting interest. Almanacs, annual publication that contained information on astronomy and weather patterns arranged according to the days, week, and months of a given year, provided the perfect steady seller because their information pertained to the locale in which they would be used.

Broasides could be published with little risk to colonial printers because they