Circle the correct answers to complete the sentences.
1. You must/mustn't respect older people. You can learn some valuable lessons from them.
2. We don't have to/have to wear uniforms on weekdays. It's the rule at our school.
3. You should/mustn't ask your parents for permission if you want to colour your hair.
4. In the past, women had to/must do all house work. It was one of their duties.