The gas,if（  ）some air, burns rapidly。

试卷相关题目

• 1Do you remember（  ）to Professor Smith during your last visit。

  A.to have beenintroduced

  B.having introduced

  C.being introduced

  D.to be introduced

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• 2She said in her letter that she’d appreciate（  ）from you soon。

  A.to hearing

  B.hearing

  C.having heard

  D.to hear

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• 3Accustomed to climbing trees,（  ）。

  A.It wasnot difficult to reach the top

  B.I had no difficulty reaching the top

  C.the top was not difficult to reach

  D.to reach the top was not difficult

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• 4Mr.Smith is not a fit person（  ）to supervise such a large office。

  A.to weak out

  B.to tun

  C.to manage

  D.to operate

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• 5There are some varieties of such particles,each（  ）up a different substance。

  A.made

  B.makes

  C.being made

  D.making

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• 6（  ）many laws of nature actually exist。

  A.Not having been discovered

  B.Having not been discovered

  C.Not having discovered

  D.Having not discovered

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• 7I don't like my hair straight so I’m going to have it（  ）。

  A.curling

  B.curled

  C.be curled

  D.been curled

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• 8We have several books（  ）。

  A.for your to choose from

  B.for your choice

  C.for the choice

  D.for you to choose

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• 9（  ）three times in a now,the boxer decided to give up fighting。

  A.Because having been defeated

  B.Becausebe has been defeated

  C.Having been defeated

  D.Having defeated

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• 10It la reported that some（  ）countries are going to have a meeting next year。

  A.oil produced

  B.oil producing

  C.producingoil

  D.oil produce

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