It is hard to say what kind of person he is．Sometimes he is very friendly; at other times he ________ be very cold．

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• 1—I wonder why Susan looks worried today. —I'm not sure, but she _____a small accident driving here.

  A.could have

  B.might have

  C.might have had

  D.must have had

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• 2Teachers _________ be sensitive to the development level of each student so as to help them better.

  A.can

  B.may

  C.are able to

  D.need to

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• 3According to the traffic rules, you _________ wear the safe belt while you are driving.

  A.can

  B.need

  C.may

  D.shall

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• 4—Isn't that Ann's husband over there? —No, it ______ be him-I'm sure he doesn't wear glasses.

  A.can't

  B.must not

  C.won't

  D.may not

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• 5One of our rules is that every student _________ wear the school uniform while at school.

  A.might

  B.could

  C.shall

  D.will

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• 6Mountain climbing ______ be really dangerous at times even though it is challenging and exciting in general.

  A.can

  B.should

  C.shall

  D.must

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• 7—Tom is in low spirits today. He ______ again in the job interview. —What a pity! He has been greeted with bad luck these days. 

  A.could fail

  B.may fail

  C.must have failed

  D.must fail

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• 8- You talk so much about London. You ________have been there. - Yeah, I went sightseeing on a tour last summer.

  A.must

  B.can

  C.will

  D.need

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