Khi vật thể hay nhóm vật thể là duy nhất hoặc được xem là duy nhất

There are billions of stars in ______ space.

First of all, robots  ___________ time and human labor.

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I’ll offer it to Tom _______, he may not want it.

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It is possible that she will come to our party tonight. She__________ come here tonight.

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The team_____ going back to their homes.

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)_____. 

(23).......... 

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I put my keys on the table, but now it’s gone. Someone_____ have taken it.

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Do you have to buy this hat? No, I _____. It isn’t necessary.

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We avoid _______ our environment.

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

Recently, it is important__________ about computers. There are a number of things to learn. 

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A terrible fire spread_______ through the old house.

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Two of the notebooks_________ Tom had lost on the bus were returned to the main desk at his dormitory.

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The number of women_____ increased.

Choose the word or phrase that best completes each unfinished sentence below or substitutes for the underlined word or phrase.

He has no idea how to manage people.

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“I can’t open this jar of mayonnaise” “_______ Lee to help you”.

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”What did you do on Sunday?”

          “It was_____ day that I went to the lake”.

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We decided not to go out for a meal_______ we were simply too tired.

Choose the word or phrase that best completes each unfinished sentence below or substitutes for the underlined word or phrase.

I have no idea where she is.

Choose the letter A, B, C or D to complete the sentence: If the sun shines, we ___________ to the village.

Our baby ______to talk yet.