Complete sentences 1-4 with must or mustn't and an appropriate verb. 1) You... a crash helmet when you ride a motorbike. 2) You... in the cycle lane.

Complete sentences 1-4 with must or mustn't and an appropriate verb. 1) You... a crash helmet when you ride a motorbike. 2) You... in the cycle lane.3) You... at more than 60 kph in a city. 4) You... when the traffic ligh is red.