Although it was not named _________ 1782, this kind of metal was used as early as 5300 BC.

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• 1Alxander Ferguson was a worker on shipyards ________ he was 23, ________ he began to play professional football．

  A.when; when

  B.until; when

  C.when; which

  D.where; when

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• 2Time is life; ________, master your time and life．

  A.however

  B.therefore

  C.moreover

  D.otherwise

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• 3________ he was only five years old, he could take care of himself when his mother was away．

  A.s

  B.Since

  C.Although

  D.Because

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• 4Father ran for a doctor; ________ mother stayed with me．

  A.meanwhile

  B.anyhow

  C.besides

  D.in that case

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• 5I suddenly got a feeling of soaring into the sky ________ the zero gravity．

  A.because of

  B.because

  C.so that

  D.For

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• 6You will be late ________ you leave immediately．

  A.unless

  B.until

  C.if

  D.or

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• 7_________ volleyball is her main focus, she's also great at basketball．

  A.Since

  B.Once

  C.Unless

  D.While

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• 8Lucy and Lily are twins, Lucy likes music ________ Lily prefers sports．

  A.as

  B.when

  C.while

  D.unless

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• 9________ she was the last person I want to see, I did all in my power to help her．

  A.Now that

  B.While

  C.As

  D.Even if

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• 10She always comes to our help when we get into trouble ________ she is very busy．

  A.since

  B.once

  C.even if

  D.so that

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