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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He tried very hard to （） the authorities of his capabilities and loyalty, only to find that the more he tried, the less they believed him.

A. tell
B. show
C. convince
D. encourage
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Mike and I really did () Leigh how to play the lost game.

A. demonstrate
B. show
C. manifest
D. display
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