(2013·安徽名校联考Ⅰ)________ some students are not aware of is ________ difficult life can be if they are not devoted to study.
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A
That; how
B
Which; what
C
What; what
D
What; how
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It is such a modern machine ______ few of the workers know how to operate.
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as
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Stephen Hawking believes that the earth is unlikely to be the only planet _life has developed gradually.
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that
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There is a common belief among them _______rubbish can and should be put to good use .
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which
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“My boy, do remember to leave things _____ you can find them again.
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where
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