Wind power is an ancient source of energy ____we may return in the near future.
#76980
A
on which
B
by which
C
to which
D
from which
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The building the windows are bright at night is our school library.
#77311
A
that
B
which
C
whose
D
of which
Cheer up! Everyone may have periods in their lives everything seems tough．
#78039
A
which
B
where
C
when
D
that
The expert’s theory, _____ my opinions were based, proved right in the end.
#77044
A
on which
B
whom
C
for which
D
that
—Why does she always ask you for help?—There is no one else , is there ?
#76332
A
who to turn to
B
for whom to turn
C
she can turn to
D
for her to turn
Then moment _________ Mary will always remember is _________ Mr．Black gave her a lot of valuable advice on how to improve her writing．
#75185
A
when; that
B
that; that
C
that; when
D
when; where