He is a teacher. He has been a teacher ____ 1990.
#46441
A
in
B
until
C
since
D
For
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--Is your ball      the door ?  --No, it’s     the chair. 
#47175
A
in, behind
B
of, on
C
behind, on
D
on, in
I’m       Class Two      Li Fang and Zhang Xia.
#50507
A
in, and
B
at, with
C
in, with
D
at, and
What a" nice day! We should go sightseeing __ watching TV in the hotel.
#50806
A
because of
B
instead of
C
together with
D
out of