Old  Richard,_________ ill so long ,is losing his memory and needs to be attended to．

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• 1He made up his mind to devote his life ______ the river ______ polluted.

  A.to prevent; to be

  B.to prevent; from being

  C.to preventing; to be

  D.to preventing; from being

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• 2When the teacher came in, the students pretended _____ the text.

  A.to read

  B.reading

  C.to have read

  D.to be reading

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• 3The secretary worked late into the night, ______ a long speech for the president. 

  A.to prepare

  B.prepared

  C.preparing

  D.to be prepared

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• 4Each button, when _______, provides a piece of beautiful music.

  A.clicked

  B.having clicked

  C.clicking

  D.being clicked

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• 5While watching television, __________.

  A.the doorbell rang

  B.the doorbell rings

  C.they heard the doorbell rings

  D.they heard the doorbell ring

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• 6When Peter speaks in public, he always has trouble _______ the right things to say.

  A.thinking of

  B.to think of

  C.thought of

  D.think of .

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• 7—What's that noise? —There's a truck stopping outside. It's someone _____ something.

  A.deliver

  B.to deliver

  C.delivering

  D.delivered

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• 8Though ______ money, his parents managed to send him to a key university.

  A.lacked

  B.lacking of

  C.lacking

  D.lacked in

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• 9Days of snowstorms have left the city ______ under thick layers of ice and some 50,000 homes without power．

  A.to be trapped

  B.trapped

  C.having trapped

  D.being trapped

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• 10_____ in Harvard is _____ most students wish for.

  A.Being educated; what

  B.To educate; that

  C.Educated; which

  D.Educating; everything

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