The factory produces two million pairs of shoes every year, half _______ are sold abroad.
#77856
A
of which
B
which of
C
of them
D
of that
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_____ in the library regulations that any book borrowed be returned by due time, or the borrower will be fined．
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A
What is required
B
It is required
C
As is required
D
Which is required
Our country should set up more national parks animals can live freely.
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A
when
B
which
C
where
D
whose
With economy getting worse，we have reached the point________we have to cut down our daily expenses.
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A
that
B
which
C
when
D
where