=>
VI/
29. The Christmas tree was decorated by my mother yesterday.
30. Ba said that he was waiting for the bus then.
31. Would you mind giving me the bag?
32. It's very interesting to learn English.
33. If I were you, I would take more exercises to get fit./If you take more exercises, you will get fit.
34. Unless we get help, we can't do the job.
35. You should not do that.

36. The sound from a vacuum cleaner can lead to permanent hearing loss.
37. We all know that paper was first used by the Chinese.
38. Mai said that she was going to read some scientific book that week.
39. Ha said that the invention of the Internet in 1969 was the greatest invention.
40. John told me that the first handheld mobile phone weighed 2.5 pounds. 
41. The manager said that apple had sold over 900 millions Iphoón globally.
42. buy
43. would live/were
44. Does the train leave

45. homeless
46. contaminants
47. untreated
48. erupt