单项选择题

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
单项选择题
While typing, Helen has a habit of stopping ______ to give her long and flowing hair a smooth.
A．occasionally
B．simultaneously
C．eventually
D．promptly
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