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