We have done things we ought not to have done and_____ undone things we ought to have done.

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• 1If city noises____from increasing, people_____shout to be heard even at the dinner table 20 years from now.

  A.are not kept; will have to

  B.are not kept; have to

  C.do not kept; will have to

  D.do not kept; have to

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• 2—Hi, Li Ming. Where are you going? —Oh, it's you—Xiaohui. I ______ you.

  A.didn't recognise

  B.hadn't recognised

  C.haven't recognised

  D.don't recognise

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• 3—Why! Where's my mobile phone? Maybe I left it on the plane. —My goodness! You ______things behind.

  A.haven't left

  B.didn't leave

  C.had never left

  D.never leave

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• 4How close parents are to their children ___________a great effect on the characters of the children.

  A.have

  B.to have

  C.having

  D.Has

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• 5When a person wants to operate the computer, _____ read instructions first.

  A.you will have to

  B.one must

  C.they will have to

  D.he has to

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• 6–It must have been lots of fun riding round in a car. –Yes, you know this was the first time that _____ round in my own car.

  A.I rode

  B.I should have ridden

  C.I've been riding

  D.I'd ridden

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