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---Do you often spend half an hour       your homework every day?---Yes, I do.
#49069
A
for
B
in
C
at
D
On
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–When did the earthquake of Ya’an happen?–It happened _______ April 20, 2013.
#48000
A
at
B
in
C
on
D
to
Where is my backpack ? It’s          the floor .
#49899
A
under
B
in
C
on
D
at
Do you want to chat ________ your friends _______ the Internet _________ weekends
#49736
A
with，in，for
B
with，on，at
C
to，on，at
D
to，at，on
What’s this_______English ?---It is a map。
#48332
A
at
B
in
C
of
D
on
 Yesterday Tom was late for school        the heavy rain.
#48274
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because
B
because of
C
as
D
including