I know it's normal for such a thing to happen，but we________it if we'd been more careful.

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• 1 It was so nice of you to come to our aid. I don't think we ______ it without you.    

  A.can manage

  B.could have managed

  C.must have managed

  D.could manage

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• 2—Shall I help clean the kitchen, Mum? —Thank you.But you ________ it because I can do it myself.

  A.mustn't have done

  B.wouldn't have done

  C.mightn't have done

  D.haven't got to do

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• 3  But for the help of my English teacher, I ________ the first prize in the English Writing Competition.

  A.would not win

  B.would not have won

  C.would win

  D.would have won

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• 4—Did you pass the driving test? —No.I ________ it，but I had little time practising.

  A.could have passed

  B.must have passed

  C.can't have passed

  D.shouldn't have passed

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• 5Scientists suggested parents _______ children do the housework to make money.  

  A.made

  B.make

  C.to make

  D.had made

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• 6At a construction site in our city the workers have uncovered an ancient wall that _______ to keep the enemy out of the city, but it requires further evidence.

  A.might have functioned

  B.would have functioned

  C.must have functioned

  D.should have functioned

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• 7 It was unusual that such close neighbors ______ not know one another.

  A.could

  B.would

  C.must

  D.should

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• 8—I failed again. I wish I _______ harder. ---But you _______.

  A.had worked; hadn't

  B.worked; don't

  C.worked; didn't

  D.had worked; didn't

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• 9 Keep up a good state of mind even if you ______ fail plenty of times.

  A.should

  B.will

  C.must

  D.need

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• 10—How's your tour around the North Lake? Is it beautiful? —It _________ be, but it is now heavily polluted.

  A.will

  B.would

  C.should

  D.must

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