It’s necessary ______ us to keep our pets clean everyday.
#51110
A
of
B
for
C
with
D
between
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--I wonder how you have improved your spoken English so fast, Li Lei.-- Chatting with my foreign friend.He’s been here for some time,you know.
#45800
A
On
B
With
C
In
D
By
—Do you always spend lots of time playing computer games?—No, but I spend much time my homework.
#50429
A
in; on
B
on; on
C
on; in
D
in; in