Scientists say human activity contributes to climate change, but they do not agree on the rate_______ climate change may be developing.

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• 1--- ________ I remind you of is to return the book to our English teacher.   ---I will give it to him _________  I see him.    

  A.That; immediately

  B.What; directly

  C.What; while

  D.Whether; once

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• 2-- ______did the teacher give you much advice? -- How to study English.

  A.What

  B.In what

  C.On what

  D.For what

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• 3He had just sent an email to his pal on the Internet ________ the system broke down.

  A.while

  B.when

  C.after

  D.since

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• 4_______ he was 12, Einstein had learned advanced mathematics by himself.

  A.As soon as

  B.At the time

  C.By the time

  D.During the time

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• 5The problem of the present world is that those who are imaginative have little experience _______ those who are experienced have weak imagination.

  A.unless

  B.although

  C.because

  D.while

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• 6_________ we could afford it, we wouldn't go abroad for our holidays.

  A.In case

  B.Now that

  C.Even though

  D.So that

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• 7Of all the destinations in the South，Gu Langyu is the very one ________I have been longing to visit.

  A.that

  B.which

  C.where

  D.what

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• 8I had been looking for the book for two days _______ I found it at last.

  A.until

  B.when

  C.while

  D.before

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• 9We'd better stay here a little longer ______ he turns up unexpectedly.

  A.although

  B.in case

  C.since

  D.if only

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• 10______ money is important, many teenagers say they want to do jobs they enjoy.

  A.Because

  B.Unless

  C.If

  D.Although

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