Cross out the incorrect verbs in the sentences.
Rules of the cinema
1 You don't have to / mustn't smoke in the cinema.
2 You must/ don't have to buy a ticket for the film, but you needn't I
mustn't sit in a particular seat. You can sit where you want.
3 If you hear the fire alarm, you have to I don't have to leave through
the fire exit immediately.
4 You mustn't/ needn't turn off your mobile phone during the film,
but you must / don't have to put it on silent so it doesn't ring.​