5 Choose the correct words.
1 You mustn't/ shouldn't leave yourmotorbike there. It isn't safe.2 He's lucky because he mustn't /doesn't have to wear a school uniform.3 We mustn't / don't have to use mobilephones. It's against the rules.4 Thave to / should walk to school becausethere isn't a bus.5 Young people must / should go to schooluntil the age of fifteen. It's the law.6 You mustn't / don't have to cheat in exams.