Some scientists believe that it won't be long _______ robots are widely used in all walks of life．

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• 1Only when your identity has been checked ____________.

  A.you are allowed in

  B.you'll be allowed in

  C.will you allow in

  D.will you be allowed in

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• 2It was announced that only when the fire was under control __________to return to their homes.

  A.the residents would be permitted

  B.had the residents been permitted

  C.would the residents be permitted

  D.the residents had been permitted

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• 3Most American cities are relatively small in terms of population when _____ with Chinese cities like Shanghai and Beijing．

  A.compare

  B.comparing

  C.compared

  D.to compare

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• 4George said that he would come to school to see me the next day, but he ______.

  A.wouldn't

  B.didn't

  C.hasn't

  D.hadn't

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• 5------ It's a long time _____ I last saw you． ------Yes, and it will be another month _____ we can meet again．

  A.before; when

  B.when; since

  C.since; while

  D.since; before

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• 6Only ________ as a translator ________ how important it is to understand foreign cultures.

  A.when did I work; I realized

  B.when I worked; I realized

  C.when did I work; did I realize

  D.when I worked; did I realize

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• 7Not until the man i，n black took off his dark glasses ________ that he was the famous film star.

  A.did I realize

  B.I realized

  C.was I realized

  D.I have realized

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• 8Only when he told me ________what trouble he was in.

  A.did I realize

  B.I realized

  C.do I realize

  D.I realize

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• 9Never before ________ seen anybody who can play tennis as well as Robert.

  A.had she

  B.she had

  C.has she

  D.she has

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• 10________ in his school that many of his fans want to get close to him.

  A.So is he popular

  B.So popular is he

  C.So popular he is

  D.So he is popular

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