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

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• 1Jack ________ 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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• 2Jack ________ 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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• 3Since 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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• 4Professor Smith, many students want to see you．________ they wait here or outside?

  A.Do

  B.Shall

  C.Will

  D.Would

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• 5The door is locked．They ________ be at home．

  A.can't

  B.mustn't

  C.needn't

  D.shouldn't

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• 6You ________ 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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• 7What ________ it be?It ________ be a car．It isn't moving．It ________ be house．

  A.can; can't; must

  B.may; mustn't; might

  C.must; mayn't; can

  D.can; mustn't; might

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• 8She just couldn't believe that her husband, to whom she had been loyal for so many years, ________ desert her after he became rich．

  A.might

  B.should

  C.shall

  D.must

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• 9The traffic is heavy these day, I ________ arrive a bit late, so could you save me a place?

  A.can

  B.must

  C.need

  D.might

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• 10Being physically examined for free twice a year is what every clerk ________ be ensured in any company of the state．

  A.must

  B.ought to

  C.shall

  D.need

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