7.The pigeons are fed every day by the old woman.
8. John will be picked up at this office.
9. The visitors were showed the new house.
10. Litter shouldn't be thrown on the ground.
11. The student were asked a very difficult question at the oral exam bay the teacher.
12. First, the text has to be read and then, the excercise have to be done.

13. Tom wsa promised a hundred Euros by his parent if the test was passed.
14. Were all the windows repaired?
15. We all were surprised by the news.
16. Are the exams being corrected right now by the teacher?
17. John has been sent a mysterious letter.
18. Where was the book found?
19. We were driven to the airport by taxi driver.