—Do you regret paying twenty dollars for the dictionary? —No．I ____ twice as much for it．

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• 1—Guess what! I have got A for my term paper. —Great! You  _______  read widely and put a lot of work into it.

  A.must

  B.should

  C.must have

  D.should have

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• 2We have been excavating layers of ash almost six metres thick, which suggests that they _______the fire burning all winter.

  A.should keep

  B.might have kept

  C.should have kept

  D.might keep

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• 3The captain urged that the mission ______ before dark.

  A.must be finished

  B.be finished

  C.ought to be finished

  D.was finished

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• 4---The book is borrowed from the library. You _______ your children touch it with their dirty hands. 　---Sorry.　    

  A.should have let　

  B.needn't have let　

  C.mustn't have let

  D.ought not to have let

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• 5------I don't know why he has made such a silly mistake in the exam. ------ He ______ it before he handed in the paper.

  A.may have checked

  B.might check

  C.must have checked

  D.should have checked

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• 6It's nearly 7 o'clock. Helen _______ come, but let's wait for her for another 5 to 7 minutes.

  A.couldn't

  B.can't

  C.mustn't

  D.may not

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• 7It is suggested that such a law ______.

  A.needn't be passed

  B.mustn't be passed

  C.not be passed

  D.will be passed

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• 8She ______ your birthday. But she had to put work first.

  A.wouldn't forget

  B.shouldn't forget

  C.mustn't have forgotten

  D.couldn't have forgotten

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• 9Helen ______ go on the trip with us, but she isn't quite sure yet.

  A.shall

  B.must

  C.may

  D.can

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• 10If it's quite convenient to you, I ______ with you next Tuesday.  

  A.stay

  B.stayed

  C.will stay

  D.have stayed

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