Необходимо выбрать верный вариант и объяснить почему1. You must/mustn039;t/can039;t eat in

Необходимо выбрать правильный вариант и разъяснить почему
1. You must/mustn't/can't eat in the classroom. It's not allowed
2. Student's can't/have to/don't have to take the rubbish out. The cleaners will do it
3. Yoy mustn't/must/can't enter the building after 10 o'clock. The entrance is closed
4. You can't/must/mustn't get permission to invite friends in your room
5.You can/cant/must sit on the grass! You will destroy the flowers.