I mustn`t drop litter in my room.

I mustn`t draw on the walls in my room.

I mustn`t eat in my room.

I mustn't make a mess in my room.

In a room (bedroom) it is impossible to litter and throw on a floor Things. Invent decors. Ventilate the house from Germs. Often do wet cleaning. Make the room cozy and beautiful for you