单项选择题

To handle the delicate situation, you must be()

A. more careful
B. more carefully
C. carefully enough
D. enough carefully

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单项选择题
The search was () when the fog got thicker.

A. called off
B. called on
C. called in
D. called for
单项选择题
Although I spoke to him many times, he never took any () of what I said.

A. attention
B. notice
C. warning
D. observation
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