6. Complete the sentences using must, mustn’t, have to, not have to (in the correct form). a) You _________ forget what the teacher has told you. It is very important for your leaming. b) I got up early this morning because I _________ go to a meeting. c) I _________ get to the shop before it closes. d) We couldn’t repair the motorcycle ourselves. We ___________ take it to a motorcycle repair Service. d) In many parts of the city, office workers ____________________ work on Saturday. f) You _________ step on that edge. It is very dangerous.