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This young tree could not have been damaged ______accident; I believe it was done _____ purpose.
#27499
A
by; on
B
for; with
C
by; with
D
for; on
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___ the employees' working efficiency, the supervisor will allow them to have a coffee break.
#29030
A
Improving
B
To improve
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Having improved
D
Improved
A salty diet may increase the risk of stomach cancer ________ 10 percent, South Korean researchers found in a study of more than 2 million people．
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at
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to
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Some students often listen to music _____ classes to refresh themselves.
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between
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among
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over
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of
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It was considerate _____ you not to play the piano while I was asleep.
#26895
A
of
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for
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to
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from