Ответ:
1) Prescriptions are written by the doctor.
2) Henry's dog must be given some food by him.
3) A letter will be got by them next week.
4) The truth should be told by Mr. Brown.
5) Sam's homework was done quickly by him.
6) She is often waited for by us after school.
7) The flowers could be planted by you in the garden.
Объяснение: