8 Advice or rule? Should/shouldn't or must/mustn't?

1. You mustn't swim in this river - it is full of crocodiles. 2. You must brush your teeth at least two times a day. 3. You mustn't touch anything electrical when you are in the bath. 4. You mustn't play in the street: it is too dangerous! 5. You should take a jacket. It's very windy outside. 6. I think we should turn right. This road isn't marked on my map. 7. We mustn't stop at the red light. 8. You look unwell. You should sit down and drink some water. 9. You should buy the red one: it suits you!