单项选择题

______is well-known, the environment in China is badly in need of improve-merit.

A. It
B. That
C. As
D. What
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It is certain that he will______his business to his son when he gets old.
A. take over
B. think over
C. hand over
D. go over
单项选择题
She is very______to ring me tonight. I can sense that.
A. liable
B. possible
C. likely
D. likeable
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