Verified answer

1. Spanish is understanded by them.
2. A new car was bought by my friend.
3. The bathroom was cleaned by John.
4. The window is closed by the teacher.
5. Handball is could played by the girls.
6. The cat was not bitten by our dog.
7. Cars are repaired by the mechanic.
8. The fire alarm is tested by the electricians.
9. The blue jeans was invented by Levi Strauss.
10. Photos are taken by Frank.