Bai 3
1Must
2mustn’t
3 mustn’t
4 must
5 must
6 must
7 mustn’t
8 mustn’t
9 mustn’t
Bai 4
1 you should be on time
3 you should bring your business
5 you should say…being treated
7 you should make loud gulding noises when drinking
2 you shouldn’tpass food one pair of chopsticker to the other
4 you shouldn’t bring outside food into restaurants
6 you shouldn’t use the phone in trains and elevators
8 you shouldn’t drink or eat while walking
10 you shouldn’t use your chopstivks to point at somebody