Experiments of this kind ______in both the U．S．and Europe well before the Second World War．

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• 1In this country, coal ______  electricity.

  A.is used to produce

  B.is used to produced

  C.is used to producing

  D.used to produce

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• 2My uncle, who _______ in Paris for 6 years, now teaches French in a famous domestic university.

  A.have lived

  B.lived

  C.was living

  D.had lived

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• 3Joe, along with her three sisters, _______great interest in writing these days.

  A.was showing

  B.were showing

  C.is showing

  D.are showing

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• 4In April last year, thousands of holiday-makers in Europe remained ________ abroad due______ to the volcanic ash cloud.

  A.sticking

  B.stuck

  C.to be stuck

  D.to have stuck

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• 5I first met your sister ten years ago, when she ____at a supermarket as a salesgirl.

  A.has worked

  B.had worked

  C.was working

  D.had been working

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• 6----I don't suppose the police know who did it. ----Well, surprisingly they do. A man has been arrested and _____ now.

  A.has being questioned

  B.is questioning

  C.has questioned　　

  D.is being questioned

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• 7Ladies and gentlemen, please fasten your seat belts. The plane _____.

  A.takes off

  B.has taken off

  C.took off

  D.is taking off.

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• 8I got the job I _______ for. The boss picked me out of 30 applicants.

  A.interviewed

  B.had interviewed

  C.was interviewed

  D.have been interviewed

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• 9--- Is it convenient to you if I call you up at 9 o'clock tomorrow morning? --- I'm afraid not. I ________ a speech then.

  A.was giving

  B.will be giving

  C.am giving

  D.will have given

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• 10—An ant has two stomachs—one for itself, one for others. —Really? Quite interesting. I ________ anything about it.

  A.don't know

  B.have known

  C.haven't known

  D.didn't know

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