When deeply absorbed in work, _____ he often was, he would forget all about eating or sleeping.
#78649
A
that
B
which
C
where
D
when
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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
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
Living with host families, ________ there may be other college students, gives her the chance to learn more about the new culture.
#78706
A
on which
B
about which
C
in which
D
among which