Learning aims:
To summarise and consolidate the function of using must,mustn’t, can, can’t to talk about customs and rules.
自主学习：Test
一. 用所给词的适当形式填空
1. “When did Mr. Smith get ___________(marry)?” “In 1980.”
2. Don’t speak ____________(loud). The baby is sleeping.
3. “No ___________(smoke)” means you mustn’t smoke here.
4. Mr. Green is a ____________(travel). He has travelled many places in the world.
5. One can’t ___________(drop) litter everywhere.
6. Jim went to school without ___________(have) breakfast.
