Professor Smith, many students want to see you．________ they wait here or outside?

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• 1The door is locked．They ________ be at home．

  A.can't

  B.mustn't

  C.needn't

  D.shouldn't

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• 2________ you like to have a walk with us this evening?

  A.Could

  B.Will

  C.Would

  D.Can

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• 3For Senior 3 students, choosing which college to attend ________ be the most exciting time in their entire school lives．

  A.must

  B.should

  C.would

  D.can

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• 4Many poorer nations are using up natural resources at a fast rate．________ people be blamed for destroying lots of rainforest if it means a better life for them?

  A.Would

  B.Need

  C.Could

  D.Should

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• 5When the Challenger exploded in 1986, people were reminded just how dangerous space travel ________ be．

  A.must

  B.shall

  C.will

  D.can

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• 6Since the flight is cancelled on account of bad weather, we ________ go by train．

  A.ought not to

  B.had better to

  C.might as well

  D.would rather not

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• 7Jack ________ be really difficult occasionally even if he's a nice guy in general．

  A.must

  B.should

  C.shall

  D.can

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• 8Jack ________ my letter, otherwise he would have replied before now．

  A.mustn't have received

  B.shouldn't have received

  C.can't receive

  D.couldn't have received

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• 9Whether very sick people ________ be helped to end their own lives is a question many people cannot answer．

  A.need

  B.might

  C.should

  D.must

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• 10You ________ her in her office last week; she has been out of the city for two months．

  A.needn't have seen

  B.might have seen

  C.must have seen

  D.can't have seen

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