The book, ___________ is green, has been lent to my brother.
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A
of which cover
B
the cover of which
C
whose covers
D
its cover
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Living in the central American desert has its problems, ________ obtaining water is not the least .
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of which
B
for what
C
as
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whose
Look out! Don’t get too close to the house ________ roof is under repair.
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A
that
B
which
C
of which
D
whose