8. This is a non-smoking area,so you   (不得在這里抽煙) .

7. If you   (沒給我打電話) ，I wouldn’ t have known aboutthe party.

6. He is wearing a gold ring on his fourth finger. He   (一定結(jié)婚了) .

5. This is our gift to you. You        (不必把它還給我們) .

4. Since the teenagers were partying very loudly,they (不能聽見) the door bell.

3. As his leg was injured,John (不能比賽) for the next couple weeks.

2. Neil wouldn't have had the accident if he   (沒有突然剎車) .

1. There is another bus later,so we     (不必上這輛) .

12. But for the kind lady,I (wander) in the street now.

11. If I were you,I (go) to the beach instead of going to work.