Complete the dialogue with must/mustn't, should/shouldn't. Tom: Mum, I don't want to go to school. Mother: But you ____________

Tom: Mum, I don\'t want to go to school. Mother: But you must. Tom: The pupils don\'t love me.Mother: Well, you shouldn\'t shout at them. You should be polite and friendly. Tom: They mustn\'t use their mobiles but they do. They mustn\'t be late for school but they are. Mother: You shouldn\'t be so angry. Try speaking to them. Tom: That won\'t help. I think I\'m ill. I have a running nose ...Mother: Oh, no, come on, Tom. Shame on you! You are OK. You must go to school. You\'re a teacher.