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

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• 1He laughed all the way ________ he went home．

  A.while

  B.as

  C.when

  D.before

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• 2The American Civil War lasted four years ________ the North won in the end．

  A.after

  B.when

  C.before

  D.then

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• 3________ mother got home, I was tidying my room．

  A.After

  B.When

  C.As soon as

  D.Before

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• 4I had just finished all my homework and was about to go to bed ________ the phone rang．

  A.when

  B.until

  C.while

  D.before

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• 5I was much impressed by the great changes and fast pace of life in Shanghai ________ I came to visit this fantastic city．

  A.at the first time

  B.for the first time

  C.by the first time

  D.the first time

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• 6Bill Bank stayed in Pyramid Hotel ________ he was in Cairo．

  A.the last time

  B.last time

  C.a last time

  D.for the last time

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• 7________ the poem a second time, the meaning will become clearer to you．

  A.Your having read

  B.While reading

  C.If reading

  D.When you read

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• 8The bus ran into the huge stone ________ the driver could stop it．

  A.after

  B.before

  C.since

  D.until

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• 9________ the boss entered the office, I knew troubles would follow．

  A.The moment

  B.At the moment

  C.For the moment

  D.For a moment

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• 10It won't be long ________ we stand out well among the powers of the world．

  A.when

  B.before

  C.since

  D.after

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