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

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• 1Look what you have done!You ________ be more careful．

  A.may

  B.should

  C.would

  D.had to

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• 2The public transportation is very convenient(方便的)in that country, so there ________ be any difficulty in traveling around．

  A.must

  B.wouldn't

  C.shouldn't

  D.needn't

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• 3Peter, if you don't like to swim, you ________ as well watch TV at home．

  A.should

  B.may

  C.must

  D.would

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• 4She doesn't answer the doorbell．She ________ be asleep．

  A.ought to

  B.might

  C.must have

  D.should

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• 5If Harry did not attend the conference last night, he ________ too much work to do．

  A.had to have had

  B.had had

  C.must have had

  D.must have

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• 6Many 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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• 7For 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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• 8________ you like to have a walk with us this evening?

  A.Could

  B.Will

  C.Would

  D.Can

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• 9The door is locked．They ________ be at home．

  A.can't

  B.mustn't

  C.needn't

  D.shouldn't

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• 10Professor Smith, many students want to see you．________ they wait here or outside?

  A.Do

  B.Shall

  C.Will

  D.Would

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