While listening to the concert, the audience is required to remain ______ and keep quiet.

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• 1As we all know,________, the pollution will get worse and worse.

  A.not if carefully dealt with

  B.until not carefully dealt with

  C.if not carefully dealt with

  D.when not carefully dealt with

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• 2It's important for the figures ________ regularly .

  A.to be updated

  B.to have been updated

  C.to update

  D.to have updated

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• 3_____ in 1936, Harvard is one of the most famous universities in the United States.

  A.Being founded

  B.It was founded

  C.Founded

  D.Founding

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• 4England is the largest of the four countries，and for convenience it ________ roughly ________ three zones.

  A.divides；into　

  B.is divided；into

  C.separates；from

  D.is separated；from

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• 5— I must apologize for _____ ahead of time. — That's all right.

  A.letting you not know

  B.not letting you know

  C.letting you know not

  D.letting not you know

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• 6_____ so delicious, the food in this market was sold out soon.

  A.Tasting

  B.Tasted

  C.Being tasted

  D.Taste

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• 7The design ________ all the ages and social groups is not easy to make.

  A.appealed to

  B.being appealed to

  C.to be appealed to

  D.appealing to

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• 8 _____ from the top of the tower, the south foot of the mountain is a sea of trees.

  A.seen

  B.seeing

  C.Having seen

  D.To see

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• 9---What can I help you, sir? --- I'd like to have this watch _______.

  A.to be repaired

  B.repair

  C.repairing

  D.repaired

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• 10______ to nuclear radiation, even for a short time, may influence genes in human bodies.

  A.Exposed

  B.Being exposed

  C.To expose

  D.Having exposed

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