1) run in the corridors a) you must b) you mustn't c) you can 2) switch off mobile phones a) you must b) you mustn't c) you can 3) do our homework a) you must b) you mustn't c) you can 4) chat during class a) you must b) you mustn't c) you can 5) be late for school a) you must b) you mustn't c) you can 6) make noise in class a) you must b) you mustn't c) you can 7) respect your teacher a) you must b) you mustn't c) you can 8) be quiet a) you must b) you mustn't c) you can 9) listen to your teacher a) you must b) you mustn't c) you can 10) ask questions a) you must b) you mustn't c) you can

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