单项选择题

The person who ______ this type of research deserves our praise.

A. originated
B. manufactured
C. generated
D. estimated
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单项选择题
You could become a good musician, but your lack of practice is ______ you ______.
A. taking; up
B. holding; back
C. making; up
D. leaving; out
单项选择题
The country ______, most of the Americans hurry home before the night falls.
A. hasn't been cleaned up
B. having not cleaned up
C. having not been cleaned up
D. is not cleaned up
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