3 Choose the correct words. 1 You must / mustn't have a passport to go to the USA.
2 You must/mustn't go to school.
3 You must / mustn't throw litter on the floor.
4 You must / mustn't wear a seat belt in a car.
5 You must / mustn't leave a shop without paying.
6 You must / mustn't keep your dog on a lead in some parks.
