Cooperation should _______ for mutual benefit in energy development and utilization.

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• 1Devotion means _______ our heart on one thing at a time and give up all other thoughts.

  A.setting

  B.set

  C.to set

  D.that setting

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• 2The playing cards we use today are much like those ______ for hundreds of years.

  A.were used

  B.used

  C.been used

  D.using

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• 3I hope to hear more about the activities ______ there.

  A.being happened

  B.to be happened

  C.going on

  D.being gone on

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• 4If Lincoln were alive today, he _______ a top athlete in many sports.

  A.would be

  B.would have been

  C.will be

  D.was

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• 5The income of high school dropouts is about ______ that of Americans with a high school diplom

  A.A.two-third

  B.two-thirds

  C.second-third

  D.two-three

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• 6_______ is not clear.

  A.That he will come

  B.He will come

  C.Whether he will come

  D.If he will come

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• 7Carbon, _______ is a very important part of living things on the earth, is rare on the moon.

  A.what

  B.that

  C.which

  D.it

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• 8As ______ chairman of _____committee, I declare the meeting open.

  A.the, 不填

  B.the, the

  C.不填, 不填

  D.不填, the

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• 9While he was in the office, he preferred ______ something  _____nothing.

  A.to do, to do

  B.to do, doing

  C.doing, to do

  D.doing, to doing

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• 10The President declared that the nation's energy demands _____ so rapidly since 1968.

  A.have grown .

  B.had grown

  C.grows

  D.has grown

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