题目内容

It's noisy in the room. Will you ______ the radio

A. [A] turn on
B. [B] turn down
C. [C] turn up

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The old man turned on the radio ______ listened to it.

A. [A] but
B. [B] and
C. [C] or

—How ______ do you write to your mother —Twice a month.

A. [A] much
B. [B] soon
C. [C] often

下列化合物在水溶液中,碱性最弱的是()。

A. N(C2H5)3
B. NH(C2H5)2
C. NH3
D. (C2H5)4N+OH-

I'm sure he'll do all he can ______.

A. [A] for help
B. [B] to help
C. [C] for helping

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