Write what you must or mustn't do when you travel.

Решение:

1. You mustn't drink dirty water.
2. You must be careful when you travel.
3. You must always wash fruit and vegetables.
4. You mustn't play on the road.
5. You mustn't throw litter out of the window.
6. You must listen to your parents.
7. You mustn't run on the bus.