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He had to work hard so that he _____ his family.

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Since_____ his new business, Bob has been working 16 hours a day.

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Both viruses and genes_____ made from nucleoproteins.

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I wish my wife_____ better now.

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Jane’s summer vacation in England led _______ an English man.

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“The cupboards are really empty”.

          “Yes, all the food_____ eaten”.

Many companies have computers at work. In addition, most universities  __________ day and night courses in Computer Science. A. have       B. has        C. had        D. having

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If you want to find good information about graduate programs in the United States, look in ________ of the College Blue Books.

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She couldn’t find her bag. It wasn’t _______

Choose the letter A, B, C or D to complete the sentence: After he had spoken, a _______ silence fell on the room.

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The car was easy to recognize so it wasn’t _______ difficult for the police to catch the thieves.

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_____by the visitor, the clavichord could not be used.

Choose the letter A, B, C or D to complete the sentence: I'd rather_____ in the field than_____ at home.

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_____ you to the job, he felt calm.

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Since we have to be there by 8.30, we_____ take a taxi.

Choose the word (a, b, c, or d) that best fits each of the blank spaces. 
Computers are very (21)____, but they also can (22) _____ problems. One kind of problem is with the computer’s memory. It is not perfect, so (23) ____ computers lose (24)______information. Another problem is with the machinery. Computers are machines, and (25)_____can break down. When computers break down, they may erase information, like chalk on a blackboard. Or they may stop doing anything at all. And there is another different kind of problem with computers. Some doctors say they may be bad for your (26)_____. 

(22).......... 

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He was the best in class at Maths and English; _______ he was the best footballer in the school.

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Some people are tall, _____ others are short.

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Frankly, I’d rather you________ anything about it for the time being.

Choose correct answer A, B, C or D to complete the sentence. The new invention may receive a lot of __________ from the people

Choose the letter A, B, C or D to complete the sentence: Science is used in all corners of the world for the __________ of human.