It never occurred to humans until the mid-l990s ______ some animals can be cloned.

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• 1So well ______ in 2009 that the world has agreed that it was the year of Chin

  A.A.did China perform

  B.China has performed

  C.was China performed

  D.China is performing

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• 2Some people skip meals or eat only tiny amounts of food and may have conditions ______ rob the body of the nutrients ______ needs to grow and stay healthy.  

  A.which…it

  B.that…that

  C.where…that

  D.where…it

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• 3The reason ________ she gave for not being present was ________ the heavy snow prevented her coming.

  A.why; because

  B.why; whether

  C.that; that

  D.how; that

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• 4He failed in the exam, _______ proves that he wasn't working hard enough.

  A.which

  B.what

  C.it

  D.that

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• 5Nowadays teachers tend to be more dependent on ________ is thought to be a great teaching aid—the computer.

  A.that

  B.which

  C.what

  D.as

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• 6Finally, the thief handed everything _______ he had stolen to the police.

  A.which

  B.what

  C.whatever

  D.that

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• 7Peter was so angry at all ____ Mary was doing ______ he walked out.

  A.what; as

  B.what; that

  C.that; which

  D.that; that

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• 8 Only when the war was over _______ return to his hometowns.

  A.have the soldiers

  B.the soldiers

  C.the soldiers did

  D.did the soldiers

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• 9In the past few years, research has suggested that Vitamin D may increase the level of serotonin（血清素）, one of the key nurotransmitters influencing our mood, and ________it helps to relieve mood disorders.  

  A.that

  B.where

  C.what

  D.which

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• 10“I'm certainly more and more to the conclusion that Iraq has, ______ they maintained（断言）, destroyed almost all of _____ they had in the summer of 1991.” Blix said.

  A.which, what

  B.as, which

  C.as, that

  D.as, what

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