Although the causes of cancer ________, we do not yet have any practical way to prevent it．

试卷相关题目

• 1Never before ______ to ______ what his parents expect of him more than it is today ．

  A.he has failed; live up to

  B.he failed not; come up with

  C.has he failed; live up to

  D.did he failed; come up with

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• 2She treasured the notebook very much, in which _____ her mother's telephone number.

  A.recorded

  B.recording

  C.was recorded

  D.were recorded

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• 3More and more farmers arrive in our city for the money-making jobs the______ before leaving that Houston.

  A.were promised

  B.have promised

  C.promise

  D.have been promised

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• 4----- How about the book you are reading now? ----- Excellent indeed. You can find many problems we have come across _____ in it.

  A.covered

  B.covering

  C.are referred

  D.referred

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• 5---Where _______ my book ? I can't see it anywhere.  --- I _______ it on this table . But now it's gone .

  A.were you putting; have put

  B.had you put; was putting

  C.have you put; put

  D.did you put; have put

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• 6Land animals are believed ______ from sea animals.

  A.to have developed

  B.to have been developed

  C.having developed

  D.having been developed

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• 7–It's really a pity that I didn't see you in Shanghai. -- I _______ to see you in the hotel, but I was too busy.

  A.hope

  B.hadhoped

  C.hoped

  D.amhoping

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• 8.Mr Smith was ________to hear the _______news that he won the first prize.

  A.astonishing ,astonished

  B.astonished,astonishing

  C.astonishing,astonishing

  D.astonished,astonished

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• 9Please tell me the after service of the computer; I'm worried about ______ a break down sometime.

  A.there being

  B.it being

  C.there is

  D.it is

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• 10 

  A.introducing

  B.introduced

  C.being introduce

  D.D.introduce

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