a) You ___mustn't______ forget what the teacher has told you. It is very important for your leaming.
b) I got up early this morning because I __have to_______ go to a meeting.
c) I ___must______ get to the shop before it closes.
d) We couldn’t repair the motorcycle ourselves. We __had to_ take it to a motorcycle repair Service.
d) In many parts of the city, office workers ______don't have to______________ work on Saturday.
f) You ______mustn't___ step on that edge. It is very dangerous.