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Numbers that us talk about the order of things

1. completa la oración con la voz pasiva. the book was written by cervantes. el libro por cervantes 2. completa la oración con la voz pasiva con ser. the tall building was designed by the architect. el edificio alto por el arquitecto. 3. completa la oración con la voz pasiva con ser. the cookies were eaten by the children. las galletas por los niños. 4. completa la oración con la voz pasiva con se. the cake was eaten. la torta. 5. completa la oración con la voz pasiva con se. used cars for sale. carros usados.

The teacher didn't explain this at all and i don't understand this