1. Julia rescued three cats.

→→ Three cats were rescued by Julia.

2. The students handed in the reports.

→→ The reports were handed in by the students.

3. Maria crashed into the blue car.

→→ The blue car was crashed by Maria.

4. Alex learned the poem.

→→ The poem was learned by Alex.

5. Steven has forgotten the book.

→→ The book has been forgotten by Steven.

6. The technician has not repaired the DVD recorder.

→→ The DVD recorder hasn't been repaired by the technician.

7. They play handball.

→→ Handball is played (by them).

8. She puts the rucksack on the floor.

→→ The rucksack on the floor is put by her.

9. The girls had lost the match.

→→ The match had been lost by the girls.

10. The teacher is not going to open the window.

→→ The window isn't going to be opened by the teacher.