About one in ten computer game players show signs of addictive behavior that ______ have negative effects on their family, friends and school work , according to a new study.

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• 1－ I didn't go fishing last Sunday because my car broke down.. －You ______ mine. I was not using it.

  A.could borrow

  B.could have borrowed

  C.must have borrow

  D.should borrow

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• 2—It's hard to believe that Jack ________ have fought with the policeman. —Yes. If one ________ ask for trouble, it can't be helped.

  A.would; will

  B.must; may

  C.should; must

  D.need; dare

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• 3 She ______ stop whomever she met to tell the story about her Ah Mao.

  A.can

  B.could

  C.would

  D.Must

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• 4When he was there, he _____ go to that coffee shop at the corner after work every day.

  A.would

  B.should

  C.had better

  D.might

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• 5--- You just think of yourself! You kept me waiting for at least three hours. --- I'm sorry that you _____ think so.

  A.will

  B.would

  C.should

  D.Could

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• 6---It's supposed to rain tomorrow. ---I know, but the forecast ______ be wrong. Weather forecasts are far from 100 percent accurate.     

  A.must

  B.could

  C.should

  D.will

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• 7Mr. Black ______ home because his briefcase is still on the desk.

  A.mustn't have gone

  B.can't have gone

  C.shouldn't have gone

  D.needn't have gone

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• 8— How much shall I pay for the phone cell? — You _______. It's free of charge.

  A.shouldn't

  B.can't

  C.don't have to

  D.mustn't

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• 9He had already learned the news. I ______ the trouble to phone him about it.

  A.needn't have taken

  B.could have taken

  C.should have taken

  D.mustn't have taken

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• 10Hi, Susan, are you interested in buying some used books for school? You _____ really save some money that way.

  A.need

  B.can

  C.must

  D.Should

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