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.
1.must to wear 2.must to live 3.mustn't exceed 4.must to stop