Transform the following sentence into active voice

Transform the following sentence into active voice:

-The book was written by the author.

Transform the following sentence into active voice:

-The cake was eaten by the children.

Transform the following sentence into active voice:

The car was repaired by the mechanic.

Transform the following sentence into active voice:

-The homework was completed by the students.

Transform the following sentence into active voice:

-The flowers were watered by my mom

Transform the following sentence into active voice:

-The movie was directed by a famous filmmaker.

Transform the following sentence into active voice:

-The house was painted by the workers.

Transform the following sentence into active voice:

-The dinner was cooked by my sister.

Transform the following sentence into active voice:

-The task was assigned by the teacher.

Transform the following sentence into active voice

-The rules were explained by the coach.