Помогите поставить в страдательный залог: 11. The pupils can do this exercise without any...

Question

Помогите поставить в страдательный залог:
11. The pupils can do this exercise without any difficulty.
12. You must not leave your bags in the hall.
13. They don't look after the children properly.

Answer 1

11. This exercise can be done by the pupils without any difficulty.
12. Your bags must not be left in the hall.
13. They children aren't properly looked after.