She is always ready to help people in trouble because she thinks it a ________．

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• 1I was doing my homework ________ I heard someone knocking at the door．

  A.while

  B.when

  C.unless

  D.if

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• 2It wasn't until nearly a fortnight later ________ I received the CD I booked on the Internet．

  A.since

  B.when

  C.that

  D.as

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• 3You'd better ________ more clothes．It's very cold today．

  A.dress

  B.put

  C.wear

  D.put on

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• 4________ students went to see Mr．Wang during the time he was ill．

  A.The number of

  B.A number of

  C.The large number of

  D.A large number

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• 5It is believed, according to some experts, that any new film filled with violence and sex won't ________ for children．

  A.do

  B.fit

  C.prepare

  D.suit

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• 6The market has ________ milk to supply us．

  A.plenty of

  B.a large number of

  C.a great many

  D.a lot

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• 7A smaller business is ________ at risk from foreign competition as our largest exporters．

  A.as many

  B.as further

  C.as much

  D.as few

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• 8The middle-aged woman ________ the habit of smoking．

  A.improved

  B.increased

  C.supported

  D.developed

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• 9Don't ________ this matter again, please．

  A.refer to

  B.referred to be

  C.refer to be

  D.referring be

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• 10Liu Xiang was so fast in the race that no one can ________ him．

  A.run for

  B.run against

  C.run at

  D.run out of it

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