Помогите пожалуйста с английским. 2-ой номер 17. Спасибо

The pupils play in the playground before classes. Some of them wear their school uniform: a white blouse or a shirt and a blue skirt or trousers. When they come into the classroom, many of the girls take off their blouses and skirts. They usually put on T-shirts and shorts. They do this because they are not comfortable in uniform as it is very hot in the room and because they dont want to get their uniforms dirty.