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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The medicine is on sale everywhere. You can get it at ______ chemist's.
A．each
B．some
C．certain
D．any
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One reason for the successes of Asian immigrants in the U. S. is that they have taken great ______ to educate their children. A. efforts R pains C. attempts D. endeavors
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