I haven't found my watch yet; in fact, I'm not sure ______ I could have done with it.

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• 1In our university there are several big parks ______ we students can go to enjoy the beautiful scenery．

  A.to which

  B.at which

  C.from which

  D.in which

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• 2Children's brains can't develop properly_______ they lack protein(蛋白质).

  A.when

  B.since

  C.because

  D.unless

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• 3The owner of the cinema needed to make a lot of improvements and employ more people to keep it running, ______ meant spending tens of thousands of pounds.

  A.who

  B.that

  C.as

  D.which

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• 4______ environmental damage is done, it takes many years for the ecosystem to recover.

  A.Even if

  B.If only

  C.While

  D.Once

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• 5In the forest we observed some trees ______ the leaves were black with disease.

  A.where

  B.of which

  C.in which

  D.whose

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• 6This is certainly the case, but ____ it is a mistake or not I don't know.

  A.if

  B.even though

  C.whether

  D.that

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• 7____ he was fired by the company is ______ he didn't work hard.

  A.What; because

  B.Why; because

  C.Why; that

  D.That; because

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• 8People in Chongqing are proud of ______ they have achieved in the past ten years .   

  A.that

  B.which

  C.what

  D.how

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• 9Could I speak to ______ is in charge of International Sales ,please ?

  A.anyone

  B.someone

  C.whoever

  D.no matter who

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• 10we can not figure out ______ quit a number of insects ,birds ,and animals are dying out .

  A.that

  B.as

  C.why

  D.when

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