=>
31. They are said to have bought this shop last year.
32. He asked me how much I though it would cost.
33. Mr.Brown whose team has lost the game looks very sad.
34. You know the man who sat next to me at Nam’s birthday party last night, don’t you?
35. Minh spends 2 hours doing his homework every day.
36. Because it rained heavily, we were late for school.
37. We used to be made to clean the house by my mother.
38. She said that she was working in a restaurant and didn't care much for it.
39. I haven't spoken to her for two years.
40. It is interesting to go swimming in the river in the summer.

31. they are said to have bought this shop last year 

32. he asked me how much I thought it would cost 

33 Mr.Brown whose team has lost the game, looks very sad.

34 you know the man who sat next to me at nam's birthday party last night, don't you?

35Minh spends 2 hours doing his home work every day

36 because it rained heavily, we were late for school

 37 we used to be made clean the house by my mother

38 she said she were working in a restaurant, and didn't care much for it

39 I haven't spoken to her for two years 

40 it is interesting to go swimming in the river in the summer