单项选择题

Without the friction between their feet and the ground, people would () be able to walk.

A. in no time
B. by all means
C. in no way
D. on any account

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单项选择题
The trouble is that not many students really know how to make use of their () time to its best

A. benefit
B. advantage
C. value
D. profit
单项选择题
One reason for the successes of Asian immigrants in the U.S. is that they have taken great() to educate their children.

A. efforts
B. pains
C. attempts
D. endeavours
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