We are trying to develop a biological technique, ________ we plan to put to good use to improve agriculture．

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• 1Professor Wooden makes roughly ＄1,000 every week, and 60 percent of ________ is spent on books

  A.which

  B.them

  C.it

  D.what

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• 2With mobile phones, we can keep in touch with ________ wherever we are．

  A.another

  B.the other

  C.others

  D.the others

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• 3Once you understand the rules of the game, you’ll enjoy ________．

  A.them

  B.that

  C.ones

  D.it

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• 4He was through with sports, not because he had to, but because he wanted ________ that way．

  A.that

  B.those

  C.it

  D.them

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• 5We decided to take a taxi．Luckily there was ________ waiting．

  A.one

  B.another

  C.any

  D.some

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• 6-The cruelty of the terrorists towards foreigners and ________ of the terrorists towards London last month, filled everyone with horror．

  A.those

  B.one

  C.that

  D.it

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• 7The doctor advised Vera strongly that she should take a holiday, but _____ didn"t help.

  A.it

  B.she

  C.which

  D.he

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• 8They are good friends. _____ is no wonder that they know each other so well.

  A.This

  B.That

  C.There

  D.It

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• 9Recently I received a letter from him, and _____ was a big surprise for me.

  A.that

  B.which

  C.it

  D.who

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• 10In fact _____ is a hard job for the police to keep order in an important football match.

  A.this

  B.that

  C.there

  D.it

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