John did the task ____ his sister.     

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• 1Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,________ two boys, aged 11 and 13, shot and killed a teacher and four girls.

  A.while

  B.where

  C.when

  D.then

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• 2Leave your key with a neighbor _______ you lock your-self out one day.

  A.ever since

  B.even if

  C.soon after

  D.in case

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• 3You will be late ______ you leave immediately.

  A.unless

  B.until

  C.if

  D.or

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• 4_______ I admit that there are still some problems about the traffic in this area, I don't mean that it can't be solved.

  A.While

  B.Until

  C.Unless

  D.As

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• 5________ enough time, but he couldn't do it better.

  A.He was given

  B.Given

  C.To be given

  D.Though he was given

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• 6 ______the Internet is of great help, I don't think it's a good idea to spend too much time on it.

  A.If

  B.While

  C.Because

  D.As

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• 7They believe that the spirit remains with the body for 3 days；_____ someone always stays with the dead person.   

  A.so during this time

  B.during which

  C.during which time

  D.so when

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• 8You will be successful in the interview _______ you have confidence.

  A.before

  B.once

  C.until

  D.though

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• 9In some western countries, ________ are called “public schools” are not owned by the public.

  A.which

  B.as

  C.what

  D.that

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• 10He said he would work it out himself, ________ ask nobody for help.

  A.and not to

  B.but not

  C.and prefer not

  D.rather than

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