1 . ________ buy your ticket from a ticket machine. There are lots of people there.

A．Not	B．Not too
C．Don’t	D．Don’t to

2 . The manner _________ a telephone is answered gives the image of the organization, so _______ polite and pleasant when answering the telephone.

A．in which; be

B．where; be

C．which; being

D．in which; being

3 . __________ 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

4 . 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

5 . Whatever happens, Ben, ________ drugs.

A．doesn’t take	B．not take
C．not taking	D．don’t take

6 . There are eight tips in Dr.Roger's lecture on sleep，and one of them is：________ to bed early unless you think it is necessary.

A．doesn't go	B．not to go
C．not going	D．don't go