Ответ:
9. The flowers are being eaten by the dog.
10. A postcard was sent to all my friends by me.
12. Restaurants will be closed by employees.
13. The doors are going to be opened by guards.
15. Lots of money has been spent on Christmas presents by parents.
18. A lot of money is paid on fast food every year by people.
19. Taxes are increased every four years by the government.