Some researchers believe that there is no doubt ____ a cure for AIDS will be found.
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which
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what
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that
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whether
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At long last the child was found on top of _____ we call the museum of science and technology.
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which
B
that
C
what
D
where
I try to understand __________ that prevents so many Chinese from being as happy as one might expect.
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why is it
B
what is it
C
why it is
D
what it is
—Where did you pick up the stamp?—It was at the post office ________ we worked in the summer vacation.
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that
B
where
C
which
D
when
My neigh bours used to give me a hand in time of trouble, _______ was very kind of them.
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who
B
which
C
that
D
it
________there are a large number of chemical factories, the air is likely to be polluted.
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Where
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That
C
Though
D
As