It is said in the book that Thomas Edison _____ the world leading inventor for about sixty years.

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• 1He must be getting thin, for his trousers _____ badly like a flag in the wind.

  A.are flowing

  B.flow

  C.flowed

  D.have flowed

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• 2Oh, the classroom is so dirty. It needs ______ before we begin our class.

  A.cleaned

  B.being cleaned

  C.to clean

  D.Cleaning

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• 3— The floor is too dirty. — I know. It______ for weeks.

  A.hasn't cleaned

  B.didn't clean

  C.hasn't been cleaned

  D.wasn't cleaned

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• 4I ______ that actress in quite a few films, but her name escapes me for the moment.

  A.saw

  B.have seen

  C.see

  D.had seen

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• 5---The food here is nice enough. ----My friend_________me a right place.

  A.introduces

  B.introduced

  C.had introduced

  D.was introduced

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• 6The Smiths ______ their breakfast when the morning post came.

  A.had

  B.has been having

  C.are having

  D.were having

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• 7He is talking so much about America as if he _____ there.

  A.had been

  B.has been

  C.was

  D.has gone

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• 8Those experienced doctors in our country _______the meeting in order to find out the real_____________ of bird flu(禽流感).

  A.attended; cause

  B.joined; reason

  C.joined; cause

  D.attended; reason

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• 9—A desktop, together with 100 DVDs, _____ to the kindergarten as a present.

  A.has been offered

  B.have been offered

  C.has offered

  D.have offered

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• 10Every possible means ______, but none ______ successful．

  A.has tried; has proved

  B.tried; proves

  C.has been tried; proves

  D.is being tried; is proved

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