单项选择题

When ______ to tell the difference between British and American English, the linguist made a long and ______ speech.

A. asked; tired
B. asked; tiring
C. asking; tiring
D. be asked; tired
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单项选择题
I saw lying on his doormat a letter ______ to him from the U.S.A.
A. addressing
B. addressed
C. to address
D. being addressed
单项选择题
We still have a lot of problems ______.
A. unsolved
B. insolving
C. unsolve
D. to be unsolved
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