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

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You mustn't eat in the classroom. "Mustn't" is the correct choice here because it indicates that it is not allowed to eat in the classroom.Students don't have to take the rubbish out. "Don't have to" is the correct choice here because it means that students are not required to take the rubbish out, as the cleaners will do it.You can't enter the building after 10 o'clock. "Can't" is the correct choice here because it indicates that it is not possible to enter the building after 10 o'clock.You must get permission to invite friends into your room. "Must" is the correct choice here because it indicates that permission is necessary to invite friends into your room.You can't sit on the grass! "Can't" is the correct choice here because it indicates that it is not allowed to sit on the grass as it will destroy the flowers.