（湖南省怀化市2014年高三第二次模拟考试）21. For more information, please send an e-mail, ______ you can also include your advice to us.
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A
when
B
where
C
which
D
that
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While shopping, you should make your own decision. You cannot simply depend on __________ is advertised on TV
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A
which
B
that
C
what
D
one
_____ you may have, you should gather your courage to face the challenge.
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A
However serious a problem.
B
What a serious problem.
C
However a serious problem.
D
What serious a problem.
It doesn’t matter to me _____I miss my train, because there’s another one later.
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A
that
B
if
C
unless
D
when