Scientists say that they have found a way to produce the human body’s own cancer-killing cells, ________ new hope to cancer sufferers.

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• 1In the past 30 years, this old man has been sticking________ the poor students to study in school.

  A.to support

  B.to supporting

  C.supporting

  D.having supported

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• 2I have no one________ me, because the others have been assigned to do other jobs.

  A.help

  B.to helping

  C.to help

  D.to have helped

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• 3________the temperature might drop, the company prepared natural gas for warming the citizens.

  A.To consider

  B.Considered

  C.Considering

  D.To be considered

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• 4Tom’s words left Mary________ whether she did the right thing.

  A.doubted

  B.to doubt

  C.doubting

  D.to be doubting

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• 5Because of consumers’ various needs, the company has no choice but________ different kinds of products.

  A.to produce

  B.produces

  C.produce

  D.producing

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• 6It is rather difficult to make friends with him, but once________, his friendship is more valuable than any other’s.

  A.gained

  B.to be gained

  C.gaining

  D.being gained

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• 7The students entered the classroom,________ down to have their French lesson.

  A.sat

  B.to sit

  C.sitting

  D.being sat

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• 8He persuades me________ part in the English competition.

  A.in taking

  B.to taking

  C.take

  D.into taking

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• 9Vegetables________ , the next thing is to cut the carrot into pieces.

  A.being washed

  B.washed

  C.to be washed

  D.washing

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• 10I have as much fun planting flowers as I now do________ with students.

  A.working

  B.work

  C.to work

  D.worked

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