Scientists say it may be five years ______ it is possible to test this medicine on human patients．

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• 1The woman was about to open the door _______ she heard a strange sound from inside.

  A.as

  B.while

  C.when

  D.then

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• 2_____ earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate.

  A.As

  B.While

  C.Because

  D.If

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• 3The time is not far away ________ modern communications will become widespread in China's vast countryside.

  A.that

  B.until

  C.before

  D.when

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• 4Animals suffered at the hands of Man ______ their homes were destroyed by people to make way for agricultural need to provide food for more people.

  A.in which

  B.for which

  C.so that

  D.in that

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• 5She walked home by herself at night, _____ she knew that it was dangerous.

  A.once

  B.as

  C.unless

  D.although

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• 6I was about to give up the project ______ it hit me_____ I could work with my roommates. That's to say, I can turn to them for help.

  A.that; whether

  B.that; when

  C.when; how

  D.when; that

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• 7It will be at least three weeks________ he recovers from his illness and returns to work.

  A.before

  B.when

  C.since

  D.after

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• 8Dr Yuan Longping grows ________ is called super hybrid rice, _________ has a high output.

  A.what; which

  B.that; what

  C.that; which

  D.what; what

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