A good teacher must be able to hold his students' attention ________ he reaches the end of the class.

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• 1It was some time _______ I realized the fact that I had been cheated by the salesman.

  A.until

  B.before

  C.unless

  D.since

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• 2Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.

  A.before

  B.once

  C.until

  D.unless

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• 3What we have been doing may not do us any good, but ______ it will benefit us or others,we'll stick it out.

  A.no matter

  B.whether

  C.however

  D.despite

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• 4________you've got the chance, you must make full use of it.

  A.Although

  B.Even though

  C.As if

  D.Now that

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• 5— You look pale. Did you sleep well？ — No. It was already midnight ________ I finished my homework.

  A.before

  B.when

  C.that

  D.since

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• 6Most probably it will be another 6 hours _____ you can have next meal, so each of you must have your stomach full.

  A.since

  B.when

  C.after

  D.before

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• 7Super Lin Dan has become a world-famous badminton player. It is years of hard training and efforts, I think, _____ has made him ______he is today.

  A.that; what

  B.what; what

  C.what; that

  D.which; what

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• 8Jack wasn't saying anything , but the teacher smiled at him _____ he had done something very clever.

  A.as if

  B.in case

  C.while

  D.though

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• 9We have to work extra hours to finish our plan, _______ the boss can't allow us to take a day off tomorrow.

  A.so

  B.or

  C.and

  D.but

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• 10Tom sat under a tree and seeing his friend, _____  up in no time.

  A.to stand

  B.standing

  C.stood

  D.would stand

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