The bear looked ________the room, but there was no one in it.
#45939
A
at
B
into
C
for
D
about
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Noise pollution was a serious problem here .
#48147
A
in the past
B
in the future
C
since then
D
once a week
The bear looked ________the room, but there was no one in it.
Noise pollution was a serious problem here .