10. on 11. for 12. up 13. without 14. with 15. without
16. have, done 17. read 18. have, been 19. played 20. take
21. Computers are used by students at their lessons.
22. The rules of the game were explained by the teacher to the students.
23. The office will be cleaned by them tomorrow
24. The costumes was designed by John Napier for Cats.
25. The dinner is served by them from 7 p.m onwards.