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1. They must arrive at the Vietnamese wedding party early. 2. They insist that we should have a meal before the trip. 3. I think you should tell your parents you're going to be late so that they won't be worried. 4. Visitors must feed the animals in the zoo. 5. You should check the arrival time of your flight carefully. 6. Staff must not smoke when serving customers. 7. Do you think we should ask before we borrow the dictionary? 8. You shouldn't smoke at your age. 9. Do you think I should tell the teacher what happened? 10. You must get up early tomorrow if you don't want to miss the first bus. 11. Although you have a passport, you must have a visa to come to the USA. 12. You should be careful in public areas in big cities in order not to be cheated. 13. The lake is very deep. You must not swim there because it's very dangerous. 14. Look at the sign "No cellphone". We must not make a call here. 15. I don't think you should go on your strict diet anymore. You are fit and healthy.