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.