1 . __________ in the library, or you’ll be fined 10 dollars and banned from entering for one month.

A．If you smoke	B．Not smoke
C．Not smoking	D．No smoking

2 . There are a few measures you can take to improve your grade, and one of them is: _________ the material you do poorly in.

A．doesn’t ignore	B．not to ignore
C．not ignore	D．don’t ignore

3 . - John, where are the cookies? Don't tell me you ate them all.
-___________. I couldn't help it. They were so good.

A．Yes, I did

B．No, I didn't

C．Yes, I have

D．Why? Sound strange