(2012·四川)Scientists study ________ human brains work to make computers.
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when
B
how
C
that
D
whether
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___ you lose the paper document, sign in www. Sina.com, __ you might download all you need.
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If, which
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So long as, what
C
In case, where
D
Even if, as
He set out for a remote village for ____ he hoped would be a peaceful retirement.
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that
B
which
C
what
D
where
It suddenly occurred to him _____ he had left his keys in the office.
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A
whether
B
where
C
which
D
that
It is the best for this kind of plant to grow in ______ is warm and rainy.
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A
that
B
what
C
which
D
where