21.In the past few years,we have had thousands of trees planted around our school.
22. Is this the recorder you want to have repaired?
23. She was glad to see her child well taken care of.
24.The result of the entrance exams was not made known to the public until last Thursday.
25. He found them seated at a table playing chess.
26. I can make you understand what I say,but you can't make yourself understand in English.
27.The girl asked him not to leave the door closed .
28. I have often heard the"ABC Song" sung,but I have never heard Alice sing it.
29. John rushed out in a hurry,leaving the door unlocked .
30. Before she came to England,she had never heard a single English word spoken .
31. Tom has been away from home for two years,leaving his room covered with dust.
32. My brother left the work half done , for you can find many books lying scattered on the floor.
33.You must get the work done before Friday.
34. When I turned back,I found the boy’s eyes fixed on the window.
35. When his wife returned,the husband noticed her hair cut short.
36.The student are told to have their homework handed in before tomorrow afternoon.
37. We are pleased to see the problem settled so quickly.
38.The surprised professor found the matter surprising .
39. Having passed all the teats,she felt a great weight taken off her mind.
40. The woman kept her eyes fixed on her baby for quite some time.