Choose the correct words (Chọn từ đúng)
1. You should / must watch this film. It's very good.
2. We should / must wear uniforms at our school.
3. You shouldn't / mustn't take dogs into the park. It isn't allowed.
4. You shouldn't / mustn't buy that T-shirt. It's expensive.
5. You should / must wear a hat. It's very sunny.
6. You shouldn't / mustn't pick flowers here. That's the rule.