_A Chinese runner,Liu Xiang,rushed to the ending line _______a surprising speed.
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A
at
B
by
C
through
D
with
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The doctor must be _______ 24 hours a day, 7 days a week in the boarding school.
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A
on call
B
by hand
C
in sight
D
on spot
I hurried to the accident spot only to find two dogs happily enjoyed what was left ____the cake and meat.
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A
for
B
with
C
of
D
to