The book made a great __________ on its readers.
A. impact
B. impect
C. perform
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The first atom bomb was __________ over Hiroshima.
A. set out
B. set off
C. set about
I look forward to your __________ support.
A. keep on
B. continue
C. continuous
How much did it cost you to study __________?
A. broad
B. aboard
C. abroad