1 b
2 must e
3 mustn't d
4 must a
5 must f
6 must c
1. You mustn't eat in class.
2. You must put out the fires.
3. You mustn't walk on the grass.
4. You must clean your bedroom.
5. You must wear a helmet when you ride your bike.
6. You mustn't feed the animals.
1 - B
2 - E
3 - D
4 - A
5 - F
6 - C
