_A container weighs more after air is put in, ________ proves that air has weight.

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• 1―I've already made up my mind. ―________, there's no point discussing it now.

  A.In case

  B.In that case

  C.On the case

  D.As the case may be

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• 2____ you may be right , I can't agree completely.

  A.While

  B.As

  C.If

  D.Since

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• 3Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don't use a nest.

  A.why

  B.how

  C.unless

  D.where

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• 4Just as too much harmony is tiresome in music,________.

  A.the life of too many benefits annoys us

  B.so, in life, too many benefits annoy us

  C.we are annoyed with lives also of too many benefits

  D.a lot of benefits annoy us in life

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• 5—Do you think we can get there on time? —Yes,_________ the bus does not break down.

  A.even if

  B.unless

  C.until

  D.so long as

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• 6We are living in an age ______ many things are done on computer.

  A.which

  B.that

  C.whose

  D.when

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• 7 —It seems that his health is improving. —Yes. It is ten years _______ he _________.

  A.that, smoked

  B.after, didn't smoke

  C.since, smoked

  D.before, smoked

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• 8— May I go and play with Dick this afternoon, Mum? No, you can't go out _______ your work is being done.

  A.before

  B.until

  C.as

  D.the moment

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• 9It is often said that the joy of travelling is______in arriving at your destination _____in the journey itself.

  A.; but

  B./ ; or

  C.not; or

  D.not; but

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• 10 John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .

  A.when

  B.as

  C.before

  D.while

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