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---It is reported that a Boeing 777-200 plane became lost in communication (失去联系) at midnight __________ the early morning of March 8th． ---I was amazed to hear that.
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A
at
B
in
C
on
D
of
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My sister works ______ a restaurant _______ a waiter.
#50098
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in, as
B
at, of
C
in, of
D
as, in
—Is your ball on the chair? — No. It’s _____the chair.
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on
B
in
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under
D
at
We all know that doing morning exercises ______.
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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.    
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at
B
after
C
before
D
since
 In my opinion, wine improves        age, and it is the same with friendship.
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A
at
B
with
C
to
D
In