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Creative students ………. drawings and paintings in the ……….. club.

 

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 word "they” in paragraph 3 refers to.

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________ sort of music does your father enjoy listening to?

Read the passage below carefully, and then choose the best answer:
The Rise of E-books
Over the past decade, e-books have revolutionized the way people consume written formation. It will probably come as no surprise the total global sales number continues to rise each year. There are several reasons why readers are buying more e-books. For starters, reading a lengths e-book in front of your computer isn't the most comfortable thing to do. But since tablet sales have exploded, readers can now relax and read their favourite e-books in bed from the beach. Many e-books are often sold at lower prices than traditional books. Since there is almost zero cost for producing e-books, some authors are offering their novels at lower prices. Another factor is convenience. In the past, keeping a large book collection meant setting aside a lot of extra space in one's home. With e-books, it is now possible for readers to carry a portable library, which contains thousands of books. To really understand e-book market though, it is important to keep up with national trends. Recent data suggests that the e-book market in the US and the UK have matured. In both of these countries, e-book sales account for roughly 20 percent of overall book sales. Although that percentage continues to increase, it is going up at a slower rate than in the past. The popularity of e-books has exploded in Russia. In one poll, 70 percent of Russians claim to have read at least one e-book. However, publishers are not too pleased with this new because approximately 92 percent of e-books in Russia are acquired illegally. In France, consumers don't appear to be loo keen on e-books at this time. Although in 2012, e-book sales comprised about 3 percent of the market, it is predicted that this number will increase at a very slow pace. Some French people believe that reading e-books on small screens is uncomfortable. Others say that the French are a cultural exception, as they like the feeling of holding a dusty old physical book. This demonstrates that no matter how popular e- books get, it is unlikely that traditional books will disappear any time soon.
5. The word "they" in paragraph 5 refers to _____

Being aware _____ the importance of economic reforms, the Vietnamese Communist Party initiated an overall economic reform policy.

(287)_______

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.
Many people today would like the traditional two-parent family back, that is to say, they want a man and a  woman to (1)...................for life; they also think the man should support the family, and the woman should stay home with the children. However, few families now (2)................. in the this category. In fact, if more women decide to have children on their own, the single-parent household may become more typical than the traditional family in many countries. Also, couples may decide to have more children, or they might take in foster children or (3).............. . And because people are staying single and living longer, there may be more one-person households. (4).......... the otherhand, some people believe that similar events happen again and again in history. if this is true, people may go back to the traditional (5).................. or nuclear family of the past. Others think that the only certainty in history is change. in other words, the structure of the future family could begin to change faster and faster and in more and more ways.

(5).......................................

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A person or thing that is loved and admired very much is the .............. 

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A man ___________ sell cars.

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“Put your books away”, said the teacher.

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An old farmer said that their living _________ a lot thanks to the knowledge their children had brought home.

Choose the underlined words or phrases that are not correct in standard written English.
When I was on holiday last summer, I was going to the beach everyday.

Rewrite the sentence
This is the most wonderful performance I have ever seen.

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They_______ time and money doing such a thing.

Rewrite the sentence
We use USB stick to store data.

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My father was disappointed __________ my school result.

Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.
 It is unlikely that he will come on time.

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On this occasion, my class is making an __________ to visit some caves near our city.

Thank you for expressing your interest in our organization during the recent ---131---. It was a pleasure meeting you at the ASA booth during the Weber Information Systems Convention. As you may recall from our conversation, we discussed how ASA membership ---132--- your career through networking opportunities as well as the industry insights offered in our monthly newsletter. The normal fee for members is just $120 a year; however, we are currently offering a new-member discount. ---133---. If you are still interested in joining, please reply to ---134--- with your mailing address. I will then forward you an application packet.

133................

Choose the word whose underlined part is pronounced differently from that of the others.

The goalie tried to catch _____ ball, but he failed.

(404)_______

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The facsimile machine was created __________ Alexander Bain in 1843.