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We should return the books to the library ______ time.
#50246
A
about
B
on
C
by
D
for
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Forget it, John. I said that just ________ fun. 
#49220
A
in
B
for
C
to
D
at
What are you doing _____ vacation?
#48594
A
for
B
in
C
on
D
at
I usually walk to school, but ____ bus when it rains.  
#50141
A
in
B
by
C
with
D
at
I think ___is necessary ___ my 20-year-old daughter to have her own mobile.
#50050
A
that; of
B
it; of
C
that; for
D
it; for
---Where is your father? ---He          to Shanghai    business.
#50469
A
has been ;on
B
has gone; for
C
has been;for
D
has gone;on