Don"t open the door _____ it is so cold. [ ]A. because B. because of C. sinc

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Don"t open the door _____ it is so cold. [ ]
A. because
B. because of
C. since
D. as

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举一反三

Someone called me at midnight but hung up _____ I could answer it. [ ]
A. as
B. since
C. after
D. before

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Be quick, we have to get to the station before 11:45 _____ we can catch the 12:00 train. [ ]
A. since
B. as soon as
C. after
D. so that

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It would be nice _____ we could get a room with a kitchen. [ ]
A. when
B. whether
C. if
D. where

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Some passengers were walking through one of the big halls at
De Gaulle Airport _____ the whole roof (屋顶) fell down. [ ]
A. while
B. as soon as
C. when
D. after

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—When did your father come back last night?
—He didn"t come back _____ he finished all the work. [ ]
A. until
B. while
C. if

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