fill in the blanks with mustn't or don't /doesn't have to.
1.They............work on Saturday.
2.Visitors............feed the animal.
3.Tim..................wear unifrom at school.
4.You.................touch that switch.It's very dangerous.
5.Don't make so much noise.We..................wake the baby.
6.There's a lift in the building,so I.............climb the stairs.
7.Staff.....................smoke when serving customers.
8.Sally is extremely rich.she..................work.
Loga
Sinh Học lớp 12
