k. I mustn’t ____ chewing gums. c. I must ____ goodbye. d. I must ____ and follow the ____. e. I must ____ my hand if I want to say something. h. I must ____ my classmates. f. I mustn’t ____ my chair. b. I mustn’t ____. i. I ____ cheat during a test. j. I must ____ my teacher / my classmates. a. I ____ say hello. g. I must ____ for explanations. l. I mustn’t use ____. m. I must be ____.

School Rules must// mustn't missing words

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