单项选择题

The police must waste no time in ______ the escaped murderer in the forest.

A. searching
B. chasing
C. investigating
D. looking
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When you drive home, you can't be ______ careful.
A. very
B. too
C. so
D. only
单项选择题
______they invite you to speak, remain silent.
A. Even though
B. Though
C. If
D. Unless
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