must / mustn't/ have to / has to /don't have to / doesn't have to
1) I am very fat. I .............. eat fruit.
2) All the drives.............. obey the traffic rules.
3) Ayşe is very ill.She ............. leave the bed.
4) The students in Turkey .............. go to school on Saturdays and Sundays.
5) You ............. knock at the door. I have got a key.
6) Sally can't see very well. She ............. wear her glasses all the time.
7) The teacher: "You ............... come to school in time."
8) My father is retired. He ............. get up early.