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dokhacan20
2 năm trước
Tính khối lượng bằng đvC của : a. 3 nguyên tử Lưu huỳnh b. 5 nguyên tử Phốt Pho c. 5 nguyên tử Cacbon có lời giải chi tiết nhe, cm mụi ngừi :>
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29. You (not see) ..............................................my sister for a long time. You (visit)..............................................us tonight? 30. I (think) ..............................................about you a lot lately, and I (come) ..............................................to the conclusion that I (not be)..............................................able to live without you. 31. The car (be) ..............................................ready for him by the time he (come)..............................................tomorrow. 32. I’m going to retire soon. By the first of July I (work)..............................................here for 25 years. 33. “Your guests already (come)..............................................” – “I know.” 34. Last night we (watch) ..........................................television when the power (fail)…………………. 35. There (be) ..............................................great changes in our village in the past few years. 36. Think carefully. I’m sure you (remember) ..............................................his name. 37. Mr. Wilson (make) ..............................................some interesting statements yesterday. 38. They (build)..............................................that bridge when I (be) …………………..there last year. 39. At this time next week they (sit)..............................................for their entrance exam. 40. By 1999 this area (be) ..............................................turned into an industrial centre. 41. Don’t leave until you (talk) ..............................................to the headmaster about the problem. 42. The radio (play) ..............................................since 7a.m. I wish someone turned it off. 43. It is nearly autumn, soon leaves (change)..............................................colours. 44. The children were frightened because the lights suddenly (go) ..............................................out and they (sit)..............................................in the dark. 45. There was something familiar about her face, but I couldn’t remember where I (see)..............................................her before. 46. I (sit)..............................................down for a rest while they (repair)…………………my shoes. 47. I (be)...........................................in this town for 15 years. My family (move)……………………here when I (be)..............................................ten years old. 48. A moment, please. I (not be)..............................................ready yet, but I (be)…………………… in a couple of minutes. 49. For the last three years I (spend) ..............................................every minute of my life on the problem. 50. By the end of this month, I hope, I (write)..............................................200 pages of my new novel.

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