American students take part in a wide variety of after-school activities _______ they develop their social skills.
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A
where
B
which
C
that
D
what
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The Spring Festival is our traditional festival, __________ people usually visit their friends and relatives.
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A
for which
B
to which
C
during which
D
about which
Humans are polluting the earth day by day, ________, of course, will cause punishment sooner or later.
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A
that
B
it
C
which
D
what
At the end of August, another serious quake in Sichuan , _______ has affected 500,000 people, happened about 30 km southeast of Panzhihua City, near the Sichuan-Yunnan border,
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A
that
B
where
C
which
D
What
Our physics teacher and English teacher always give their lessons in a lively and clear way, ______ greatly benefits us students.
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A
from which
B
in which
C
that
D
which