While I  ............ T.V last night, a mouse ran across the floor.

Had we not watched the football match last night, we___________________ our work.

Did you take _______ photographs when you were on holiday? 

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I explained ...........him what it meant.

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The receptionists change the artwork in the clinic's waiting room  ______________  and rearrange the layout of the furniture.

There have been ______innovative policies to combat traffic congestion, and as a result, traffic continues to be a major problem

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Vietnamese students are forced to take entrance examination before being admitted to
entrance examination.
 

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Workers are paid money for their …………

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After the floods, contaminated water was a serious __________ to public health.

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________ have enough apples, she’ll make an apple pie this afternoon.

 Kelly and Tim persuaded me  ............  the party.

Whether it is. ................ to register for a student discount card depends on the needs of the individual.

Yesterday, I ........  a serious accident while I  .............  on the beach.

 If you want the job done well, you had better do______ ______. .

Choose the correct answer in each sentence.

The report describes the environmental impact on lakes and rivers of using ------- energy sources.

Choose the best answer among A, B, C or D that best completes each sentence: The ancient Aztec of Mexico had no technology for making tools from metal….....…., they had Sharp knives and spears made from a stone called obsidian.

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You are old enough. I think it is high time you applied a job.

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The scientists ……….. the behavior of the laboratory animals.

............... Mr. Fowler or Ms. Bloch will have to travel to London for the symposium on textile manufacturing.

 John, what is that noise? Is there_______ on the street? 

______ time he was a student, he did ______ but go to parties.