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Students should _______ to smoke.   
#58541
A
not be allowed
B
be not allowed
C
not allow
D
be allowed
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Why was the house on fire? _______ lightning hit it.
#57989
A
Because
B
Since　
C
As
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I think he’s been drinking, _________ I’m not completely sure.
#56415
A
if
B
though
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They will lose the game ______they try their best.
#55457
A
unless
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You should keep working hard ____ you have passed the exam.
#56116
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since
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Playing basketball is sometimes very tiring, ______ I enjoy it very much.
#55416
A
so
B
but
C
if
D
or