No one knows exactly ______ this important discovery was made.

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• 1You should be careful of such a person ______ flatters you in your presence and speaks ill of you in behind.

  A.who

  B.that

  C.as

  D.which

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• 2Many experts hold the view ______ teacher development is ______ the key to better education lies.

  A.which; where

  B.which; in which

  C.that;where

  D.that;in which

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• 3Her father is a famous writer, ______ always makes her very proud.

  A.that

  B.which

  C.who

  D.what

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• 4______ we know some basic knowledge concerning AIDS, we can protect ourselves from being infected.

  A.If only

  B.Even if

  C.So long as

  D.Unless

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• 5——Have you got the results of the final exam? ——Not yet. I'm afraid it will be a few days ______ we know the final results.

  A.before

  B.after

  C.until

  D.when

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• 6— How long is it ______ you picked up your badminton training? — It was not until my finance became better in last December ______ I started the training.

  A.before; when

  B.until; that

  C.that; when

  D.since; that

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• 7I think you should end it _______ it's too late, or you may be sorry about it later.

  A.after

  B.when

  C.until

  D.before

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• 8My brother can ride a horse and swim, and he can shoot _______.

  A.as well

  B.also

  C.as well as

  D.either

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• 9________ I exist is a long-lasting surprise, ________ is life.

  A.What; which

  B.That; which

  C.That; as

  D.What; as

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• 10Our new science teacher comes from either New York or Washington. But I can't remember _______.

  A.where

  B.there

  C.which

  D.that

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