I couldn’t follow what he said _______, but at last I understand. 
#46617
A
for the first
B
at first
C
the first
D
at the first
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They arrived       Paris      a winter evening.
#48020
A
at, in
B
to, on
C
in, on
D
in, at
There are many tall trees _____ our classroom.
#50349
A
in the front
B
in front
C
in front of
D
in the front of