7.The book isn't opened by him

8.The letter isn't written(by you)

9.I am hitted

10.Stamps are collected by John

11.Our room aren't cleant by us

12.Meals are cooked by my sister everyday

13.This picture is always admired by people

Chúc bạn học tốt ^^

7. the book is not opened by him

8. the letter is not written by you

9. I am hit by somebody

10 stamps are collected by John

11. our rooms are not cleaned by us

12. meals are cooked by my sister every day

13. this picture is always admired