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—I called you yesterday evening, but nobody answered.—Oh, ______ at that time.
#52123
A
I’m cooking
B
I cooked
C
I cook
D
I was cooking
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 It is time for class. Let’s  stop _______.
#55772
A
playing football
B
play football
C
from playing football
D
to play football
—Do you think a radio is useful in learning English? —Sure. A radio can _____ listening English songs and reports.
#54967
A
be used by
B
be used as
C
be used for
D
be used to
 Can you hear someone          in the classroom? It is Mary.
#52115
A
sing
B
sings
C
singing
D
sang
 Your sister is studying in the room. Let’s _________.
#52289
A
quiet
B
be quiet
C
to be quiet
D
to keep quiet
The story reminded me ______ an experience I once had.
#53849
A
of
B
to
C
at
D
On