Поставьте must или mustn’t. 1.you look pale. i think you … see the doctor. 2.it’s very slippery outside. you … run there. 3.you … throw litter on the pavement. 4.children … look neat and clean at school. 5.you … make noise in the library. 6.you … brush your teeth before going to bed. 7.you … fasten your seatbelt in a car. 8.children … watch tv a lot. 9.you … light a fire in the forest. 10.you … be friendly to other people.
2. mustn't
3. mustn't
4. must
5. mustn't
6. must
7. must
8. mustn't
9. mustn't
10.must