—Tom graduated from college at a very young age. —Oh,he__________have been a very smart boy then.

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• 1—Catherine,  I have cleaned the room for you. —Thanks. You_______ it.  I could manage it myself.

  A.needn't do

  B.needn't have done

  C.mustn't do

  D.shouldn't have done

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• 2---Did Daniel take my football away? ---No, I think it _____ be him, for he doesn't play football at all.

  A.must

  B.would

  C.can't

  D.shouldn't

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• 3It was so dark outside that the little child ________ go out by himself.

  A.dare not to

  B.dared

  C.dares

  D.didn't dare to

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• 4It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.

  A.shall

  B.will

  C.need

  D.may

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• 5“I _________ her a long time ago,” he doubted, “She doesn't look at all familiar.”

  A.might have met

  B.should have met

  C.might meet

  D.should meet

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• 6--- The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job? ---____ my students have a try?

  A.Shall

  B.Must

  C.Will

  D.May

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• 7Every time she was in trouble, she went to him for help, as he said he _____ do anything for her.

  A.should

  B.must

  C.would

  D.might

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• 8As to the question of whether we will sell our house or who we shall sell the house to, you ____ have answer by tomorrow.

  A.shall

  B.will

  C.could

  D.must

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• 9I ________ be a little bit slow, but at least I don't make stupid mistakes.

  A.should

  B.may

  C.must

  D.need

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• 10You were stupid to try climbing up there. You ______ yourself.

  A.can kill

  B.might have killed

  C.might kill

  D.must have killed

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