Elephants have their own way to tell the shape of an object and____it is rough o

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Elephants have their own way to tell the shape of an object and____it is rough or smooth.[     ]
A.不填
B. whether
C. how
D. what

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举一反三

The traditional view is_____we sleep because our brain is" programmed" to make us do so.[     ]
A. when
B. why
C. whether
D. that

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Leave your key with your neighbor      you lock yourself out one day. [     ]
A.  as long as
B.  even though
C.  in case
D.  as if

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It doesn"t matter _________you turn right or left at the crossing ,both roads lead to the park.[ ]
A. whether
B. how
C. if
D. when

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Everything was placed exactly ______he wanted it for the graduation ceremony.[ ]
A. while
B. when
C. where
D. though

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You could hear water pipes cracking _____ they _____ because of the cold. [     ]
A. when; burst
B. before; were burst
C. when; were burst
D. before; burst

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