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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单项选择题

______ often I try, I cannot find the answer.

[A] Although
[B] Whatever
[C] As
[D] However

单项选择题

E-mail is a convenient, highly democratic informal medium for conveying messages that ______ well to human needs.

[A] adheres
[B] reflects
[C] conforms
[D] satisfies

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