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1. MUST-MUSTNT OBLIGATIONS

3. We must give seat to the old people on public buses

4. We must help to the disabled people

5. We must brush our teeth

6. We mustn’t eat or drink on public buses

7. We must listen to our teacher

8. We must keep off the grass

9. We mustn’t disturb other people

10. We mustn’t make noise in class

11. We must obey the school rules

12. We must wear school uniforms

13. We must stop at the red light

14. We must do our homework

15. We must come to school on time