单项选择题

The international police has come into existence and they were ______ the key to global security.

A. thus
B. for
C. or
D. otherwise
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单项选择题
— What did you say — Oh, nothing. I was just thinking ______.
A. loud
B. aloud
C. loudly
D. louder
单项选择题
There are only five minutes left before the train leaves. You should run ______.
A. fast as possible as you can
B. as quickly as you can
C. as fast as possible
D. possible as fast as you can
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