（2014年北京市西城区高三5月二模试题）31. A person who has never tasted bitter won’t know ______ sweet is.
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which
B
what
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when
D
why
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— Do you know__________?— Next Friday.
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A
when did the book come out
B
when the book came out
C
when will the book come out
D
when the book will come out
I don’t doubt ____________ she can do it well, but I doubt _________ she is willing to do it.
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A
that; if
B
that; that
C
if; if
D
if; that
Please hold on to _____you are strong and try to improve the weak subjects.
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A
when
B
where
C
what
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After ______ seemed an endless wait, it was her turn to enter the personnel manager's office．
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A
that
B
how
C
what
D
why