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

试卷相关题目

• 1— Just now Jenny gave ten dollars to a person in trouble.— She________others.

  A.was always helping

  B.is always helping

  C.always helped

  D.had always helped

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• 2I'll go to the teachers' office as soon as I finish what I _____.

  A.wasdoing

  B.amdoing

  C.havedone

  D.hadbeendoing

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• 3—Can you guess what’s the front page news today?—Of course, these days everybody _____ about the earthquake.

  A.is talking

  B.talked

  C.has talked

  D.had talked

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• 4The Internet, as well as newspapers and magazines, ________ a more and more importantpart in our daily life.

  A.have played

  B.are playing

  C.is playing

  D.has been played

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• 5—Do you think we should accept that offer?—Yes, we should, for we ________ such bad luck up till now, and time ________ out.

  A.have had; is running

  B.had; is running

  C.have; has been run

  D.have had; has been run

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• 6— ________ for the glass! —It’s OK. I’m wearing shoes.

  A.Look out

  B.Walk out

  C.Go out

  D.get out

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• 7—I hear you ________ in a pub. What's it like?—Well, it's very hard work and I'm always tired, but I don't mind.

  A.are working

  B.will work

  C.were working

  D.will be working

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• 8You forgot to go to the meeting? You _____important things. It’s so disappointing.   

  A.had always forgotten

  B.are always forgetting

  C.always forget

  D.were always forgetting

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• 9Because the shop ______, all the clothes are sold at half price.

  A.has closed down

  B.closed down

  C.is closing down

  D.had closed down

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• 10--- Would you care for a cup of coffee? --- I ________ one. Thank you just the same.

  A.had

  B.have had

  C.would have

  D.will have

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