They are always ready _______ helping.
#50888
A
for
B
of
C
to
D
in
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Look at the library. It's our classroom.
#47530
A
in the front of
B
on front of
C
in front of
D
on the front of
Liu Mei is short. So she sits _______the class.
#50681
A
in the front of
B
in front of
C
in the front
D
behind