Examination compositions, together with most business letters and government reports, are the main situations ____ formal language is used.
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A
in which
B
on which
C
of which
D
for which
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This is the only one of the books on space ___.
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A
that has been written
B
that have been written
C
which have been written
D
which has been written
I think this is the very work that we must finish ____ her.
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A
to help
B
help
C
helping
D
helped
.If their marketing plans succeed, they ____ their sales by 30 percent.
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A
will increase
B
have been increasing
C
have increased
D
would be increasing