The worsening of global warming, _____human activities are to blame, has led to frequently extreme weather.
#78724
A
by which
B
for which
C
that
D
what
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Rock-climbing is a breathtaking activity, very popular nationwide among young people, cooperation as well as courage plays an important role.
#78694
A
who
B
which
C
that
D
where
Have you ever noticed the house, ________ windows are always closed?
#78655
A
where
B
which
C
when
D
whose
In the past few years, My Heart Will Go On was a popular song among young people, ____ were often heard singing it at parties．
#78654
A
they
B
that
C
who
D
which