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] pains
[B] endeavors
[C] efforts
[D] attempts
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______ often I try, I cannot find the answer.
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E-mail is a convenient, highly democratic informal medium for conveying messages that ______ well to human needs.
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