There used to ________ a school here.
#60797
A
being
B
be
C
have
D
has
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Around the world, more and more people are _________ dangerous sports activities, because life in modern societies has become safe and boring.
#61983
A
taking out
B
taking off
C
taking part in
D
taking care of
---Miss Hu, I have trouble __________ grammar and __________ the text.
#55875
A
with; to understand
B
on; in understanding
C
with; understanding
D
on; to understand