.

Look at the sign, Sir. We don’t permit _________ in the hall.

A．smoke

B．to smoke

C．smoking

D．to have a smoke

补全单词。

1.What’s the m      _     with you,Tom?

2.I’m so t      _    because it’s hot today and I walked for a long time.

3.Look!A boy is l       __  (lie) on the grass and looking at the sky.

4.I have to see the dentist because I have a t            .