A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.

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• 1Some people claim ________ the rumor that some Egyptians are planning a 100,000 people anti-government protest．

  A.to overhear

  B.to have overheard

  C.having overheard

  D.to be overheard

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• 2I found I could easily make myself _________ by using sign language.

  A.understood

  B.understand

  C.to understand

  D.being understood

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• 3Most of the teachers ______ to visit our school were young ones.

  A.invited

  B.to invite

  C.being invited

  D.had been invited

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• 4The lady spoke slowly, trying to make herself ______.

  A.understand

  B.understanding

  C.understood

  D.to be understood

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• 5He had an accident ______ to work and was badly injured．

  A.driving

  B.driven

  C.to drive

  D.drove

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• 6______ with care, one tin will last for six weeks.

  A.Use

  B.Using

  C.Used

  D.To use

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• 7Standing there，I could almost smell the rain coming．And it did．Suddenly the lightning flashed through the clouds，nearly ________ me．

  A.having blinded

  B.blinded

  C.blinding

  D.to blind

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• 8 ________ all day, I went to bed early.

  A.Working hard

  B.Worked hard

  C.Having worked hard

  D.To work hard

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• 9________ many times, he finally understood it.

  A.Told

  B.Telling

  C.Having told

  D.Been told

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• 10John has really got the job because he showed me the official letter ________ him it.

  A.offered

  B.offering

  C.to offer

  D.to be offered

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