Rock-climbing is a breathtaking activity, very popular nationwide among young people, ______ cooperation as well as courage plays an important role.
#31049
A
who
B
which
C
where
D
of which
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— Did he realize the serious situation immediately?— No. It was quite a long time ________ he really realized it.
#34285
A
now that
B
when
C
ever since
D
before
You can make a complaint to the local government ____you are happy with the way things are.
#30961
A
unless
B
if
C
once
D
as