The teaching building has five floors. My classroom is ______________ the third floor.
#50548
A
on
B
in
C
at
D
to
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John’s parents live______ him _______Shanghai.
#48277
A
in;wth
B
with;in
C
to;in
D
with;at
_____ end of May, we will finish _____lessons. 
#47284
A
At the; to learn
B
At; learning
C
At the; learning
D
At; to learn