---Lucy, is maths difficult to learn in a foreign school? ---I’m not sure, but no subject can be learned well __________hard work.
#46054
A
without
B
through
C
by
D
with
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Thanks_____ your letter and the photos.
#49124
A
of
B
to
C
for
D
in
I like to sit __________ the bus . 
#50300
A
in the front of
B
in front of
C
in the front
D
at back of