______ some teenagers don't realize is _______ difficult life can be after they get addicted to drugs．

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• 1From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.

  A.when

  B.until

  C.since

  D.before

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• 2The crossing was blocked by many trucks and buses, _______ made it impossible for us to go to work on time.

  A.where

  B.what

  C.which

  D.that

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• 3Expect everything to go wrong in advance, _______ you may feel quite so bad when it does.

  A.as if

  B.and

  C.or

  D.so that

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• 4.It will not be ________ we can meet again.

  A.long before

  B.before long

  C.soon after

  D.shortly after

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• 5The old man lost his money and he has been worried ________.

  A.even if

  B.even as

  C.ever since

  D.as if

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• 629.It was _____he said ____disappointed me.

  A.What; that

  B.that; that

  C.what; what

  D.that;what

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• 7.I was about to leave for work ______the telephone rang.

  A.as

  B.until

  C.while

  D.when

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• 8—You see, I'm poor in maths, you are not good at English, and... — That's _______ we should help each other.

  A.when

  B.where

  C.how

  D.what

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• 9It is imagination _______ makes the world colorful, full of vigor and vitality.

  A.where

  B.what

  C.that

  D.when

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• 10---Mum, can I go out to play football with Alice? ---No, you can't _______ your homework is done.

  A.while

  B.after

  C.until

  D.as

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