The American Civil War lasted four years ______ the North won in the end.       

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• 1Though they met for the first time, they talked________they were good friends.

  A.even if

  B.as if

  C.even though

  D.if only

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• 2He is only too ready to help others, seldom, ________ refusing them when they turn to him.

  A.if never

  B.if ever

  C.if not

  D.if no

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• 3________ the day went on, the weather got worse.

  A.With

  B.Since

  C.While

  D.As

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• 4________ we started thinking and believing we could do it, anything was possible.

  A.As

  B.While

  C.Until

  D.Once

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• 5_____ days went by, he didn't succeed in anything he had planned.   

  A.With

  B.When

  C.As

  D.While

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• 6A dozen ideas were considered ______ the chief architect decided on the design of the building.  

  A.because

  B.before

  C.whether

  D.unless

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• 7It proves that being creative may be more important than experience ______ it comes to starting your own business.

  A.while

  B.as

  C.since

  D.when

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• 8I didn't realize my mistake________my teacher had a face to face talk with me.

  A.until

  B.after

  C.since

  D.when

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• 9________ you have the drug habit, you'll find it hard to get rid of.

  A.Unless

  B.Once

  C.Though

  D.Before

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• 10—The plane is due to take off at 7:50 from the airport.—________ we fail to arrive there in time?—Try to take another flight then.

  A.What if

  B.As if

  C.Even if

  D.Only if

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