You can hardly imagine the once clear canal _____ so seriously polluted that no fish can live in it.

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• 1 ______ himself to supporting his brother's son,he has to let one of his children leave school.

  A.Having committed

  B.Committed

  C.Being committed

  D.To commit

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• 2Though _____ focus from work to family, the 34-year-old actress refuses to be a full-time housewife.

  A.having shifted

  B.to have shifted

  C.shifted

  D.being shifted

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• 3______ volcanoes for many years, I am still amazed at their beauty as well as their potentialto cause great damage.

  A.Studied

  B.Having studied

  C.Studying

  D.To have been studied

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• 4That is one of those books that _____ worth reading.   

  A.is

  B.are

  C.has

  D.have

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• 5_____ since the night before, I felt very hungry.

  A.Having not eaten anything

  B.Not eating anything

  C.I hadn't eaten anything

  D.Not having eaten anything

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• 6______ the program, they have to stay there for another two weeks.

  A.Notcompleting

  B.Notcompleted

  C.Nothavingcompleted

  D.Havingnotcompleted

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• 7The hurricane died away, ___________ a lot of damage to the coastal city.

  A.caused

  B.causing

  C.having caused

  D.to have caused

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• 8______ all the accusations with convincing evidence, the man was declared innocent and set free.

  A.Denying

  B.Having denied

  C.Denied

  D.Being denied

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• 9______ all the required papers, he didn't answer the questions fluently in class.

  A.Having not read

  B.Not having read

  C.Not read

  D.Not to read

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• 10____ in the city for thirty years, the old man moved back to the countryside.

  A.Having worked

  B.Working

  C.To have worked

  D.To work

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