_______ laws of motion are simple, motion, as we see it in the world about us, certainly is not.
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A
When
B
While
C
As
D
Even
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He gets fifty thousand pounds a year ______I get twenty million, which makes me upset.
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since
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while
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It is playing computer games _______ he spends so much time that he fails all the exams
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which
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Leave your key with your neighbor ________ you lock yourself out one day.(2012·辽宁)
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as long as
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The little girl who got lost decided to remain ____she was and wait for her mother.
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where
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Amazing it is, an astronaut’s superior position is filled with potential danger.
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when
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if
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unless
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as