It is difficult for us to learn a lesson in life _____we've actually had that lesson.

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• 1 Although he knew little about the large amount of work done in the field , he succeeded ____other more well-informed experimenters failed.

  A.as

  B.unless

  C.what

  D.where

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• 2— How long have you been here？ — ______ the end of last month，

  A.In

  B.By

  C.At

  D.Since

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• 3——Your book, Tommy? ——No, Mom, it's my friend's. ——Remember to return it to ____ name is on it.

  A.what

  B.which

  C.whose

  D.whoever

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• 4A model or an experiment in a science class can help students see things which would ______ remain hidden.

  A.otherwise

  B.still

  C.thus

  D.therefore

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• 5Will you deliver, _____ do I have to come to the shop to collect the goods?

  A.and

  B.or

  C.so

  D.then

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• 6He does so little work in the office that for all practical purposes it would make no difference _______ he didn't come.

  A.if

  B.when

  C.why

  D.whether

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• 7—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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• 8Just 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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• 9Most 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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• 10____ you may be right , I can't agree completely.

  A.While

  B.As

  C.If

  D.Since

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