The first use of atomic weapons was in 1945, and their power _____ increased enormously ever since.

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• 1By the time he realizes the mistake he _____, it will be too late for him to do anything about it.

  A.has made

  B.made

  C.makes

  D.will make

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• 2I _____ the dance performance many times, each giving me a new understanding.

  A.watch

  B.watched

  C.have watched

  D.am watching

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• 3Although the food price _____ a little bit so far, we doubt whether it will remain so.

  A.went down

  B.will go down

  C.was going down

  D.has gone down

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• 4He was hoping to go abroad but his parents _____ that they won't support him unless he can borrow money from the bank.

  A.were deciding

  B.have decided

  C.decided

  D.will decide

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• 5He is the only one of the students who _____ a winner of scholarship for three years.

  A.is

  B.are

  C.have been

  D.has been

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• 6—  ___ you ___ him around the museum yet? —  Yes. We had a great time there.

  A.Have … shown

  B.Do … show

  C.Had … shown

  D.Did … show

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• 7Although medical science _____ control over several dangerous diseases, what worries us is that some of them are returning.

  A.achieved

  B.has achieved

  C.will achieve

  D.had achieved

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• 8— We _____ to put off our school sports meet until next month. — I _____ that.

  A.have decided; didn't expect

  B.decided; didn't expect

  C.have decided; haven't expected

  D.decide; don't expect

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• 9My brother is an actor. He ______ in several films so far.

  A.appears

  B.appeared

  C.has appeared

  D.is appearing

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• 10For many years, people _____ electric cars. However, making them has been more difficult than predicted.

  A.had dreamed of

  B.have dreamed of

  C.dreamed of

  D.dream of

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