The new machine，if _________ properly，will work at least ten years.

试卷相关题目

• 1Studies show the electronic devices people have made much use of _______ music may be causing hearing loss in many people.

  A.enjoy

  B.to enjoy

  C.enjoying

  D.enjoyed

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• 2Henry can't attend the party _____ at Tom's house at present because he is preparing the speech at the party _____ at Marie's house tomorrow.

  A.held; being held

  B.to be held; to be held

  C.to be held; held

  D.being held; to be held

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• 3We should prevent such a silly mistake _____ again.

  A.occurring

  B.to occur

  C.to be occurred

  D.from being occurred

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• 4You can't imagine what great trouble they have _____ the problem _____.

  A.to solve; being talked about

  B.solving; discussing

  C.to solve; to talk about

  D.solving; being discussed

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• 5A new technique _________ out, the yields (收成) increased by 20% .

  A.having working

  B.having been working

  C.has worked

  D.had been worked

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• 6There're so many kinds of tape-recorders on sale that I can't make up my mind _____ to buy.

  A.what

  B.which

  C.how

  D.where

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• 7 There is nothing more I can try _______ you to stay, so I wish you good luck.

  A.being persuaded

  B.persuading

  C.to be persuaded

  D.to persuade

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• 8_____ wherever you go is the price you pay for being famous.

  A.Being recognized

  B.To recognize

  C.Recognizing

  D.Having recognized

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• 9Anyone _____ bags， boxes， or whatever， was stopped by the police.

  A.seen carry

  B.seen carrying

  C.saw to carry

  D.saw carrying

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• 10_____ back problems， always bend your knees when you lift heavy objects.

  A.Avoiding

  B.To avoid

  C.Having avoided

  D.To be avoiding

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