Помогите пожалуйста сделать номер второй .Я не поняла как его делать.

Заподни пропуски с must и mustn't И ты получишь песню

School uniform Every day! Who looks cool In blue and grey? You must  wear jeans And you shoes  are not clean. You must be here At eight fifteen. You must not wear shorts  (I do not know why) You must not run in corridors And where is you tie? You must tell a teacher  If you feel in danger. You must ask first Before you go with a stranger.