Choose the correct answers to complete the sentences

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