He pushed his way ______ the crowd to the door.
#49247
A
through
B
across
C
in
D
over
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My sister works ______ a restaurant _______ a waiter.
#50098
A
in, as
B
at, of
C
in, of
D
as, in
We all know that doing morning exercises ______. 
#50401
A
is good for our healthy
B
are good for our healthy
C
are good for our health
D
is good for our health
Only four days remained ____ the exam.    
#50123
A
at
B
after
C
before
D
since