31. What is his favorite subject? His favorite subject is English. 32. Why does he like English? Because he thought it was useful. 33. We can't be late for class. We must arrive at the club on time. 34. Let's not run in the corridor. /Stop talking. /Stop smoking. 35. We can't eat in the classroom. You must eat in the restaurant. 36. We listen to music in class. 37. We can't fight with classmates. What are your school rules? We must wear school uniforms. 39. What are your house rules? We can't stay outside very late. 40. It is important to observe school rules.
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