6.5 Modal verbs for obligation and permission

1) I _____ (must/mustn't) try to do more exercise. I want to be fit and healthy.

2) We are lucky to have enough food and a warm house. We _____ (must/mustn't) complain about unimportant things.

3) I feel exhausted all the time. I _____ (must/mustn't) try to get more sleep.

4) We _____ (must/mustn't) be late again. We don't want the other to think we are unreliable.

5) I ____ (must/mustn't) stop biting my nails. They look terrible.

6) The sign says you ____ (can't/mustn't) park here.

7) Police officers and soldiers ___ (must/have to) wear uniforms.

8) You ___ (can't/mustn't) go on this rollercoaster if you are less than 1.4 metres tall.

9) Architects ____ (mustn't/need to) be good at drawing.

10) You ____ (need to/don't need to) be female to be a nurse.

11) Airline pilots ___ (must/can) have excellent eyesight.

12) You ____ (need/have to) be physically fit to be a fire-fighter.