Відповідь:
Пояснення:
Ex1: 1)a 2)b 3)b 4)a 5)c 6)b
Ex2: 2 She must do her homework 3 I mustn`t arrive late for the exam
4 He mustn`t wears earrings at school 5 You must a bring from your parents letter 6 Students must help their teachers
Ex3: 3 must not 4 must
5 must 6 must not