I. 
23. This room hasn't cleaned since last week .
24. Have the letters been sent yet ? 
25. The valua picture has just stole 
26. Most of student have known how to use the computer up to now 
II 
27. The receptionist who answered the phone was very polite 
28. My mother works a company which makes clothes for women 
29. I saw a dog and a boy in garden that  love next door. 
III. 
30. Some of my books have been taken away
31. A lot of money have been spent on advertising up to now
32. The victims have been provided with food and clothing
33. I have never been treated with such kindness