One reason for the successes of Asian immigrants in the U.S. is that they have taken great() to educate their children.

单项选择题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

单项选择题Mike and I really did () Leigh how to play the lost game.

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