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1. Children have to/should help their parents.2. Should/May I come in? 3. All passengers can't/mustn't use their mobile phones. 4. Everybody can/must learn a foreign language. 5. You don’t need to/mustn't smoke here.6. You mustn’t/don't have to come with us if you don't want to.7. You don’t need to/mustn’t be very rich to go skiing nowadays.8. I think you should/can go out more and meet new people.9. You must/need to have a visa before travelling to the USA. It’s the law.10. I am young. I should/can run for miles.