The book, ___________ is green, has been lent to my brother.
#77934
A
of which cover
B
the cover of which
C
whose covers
D
its cover
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He made another wonderful discovery, _______ of great importance to science. 
#76145
A
which I think is
B
which I think it
C
which I think it is
D
I think which is
Mr. Li lent me a book last week, _____I have learned a lot about earthquakes.
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A
to which
B
for which
C
from which
D
with which