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minhbui31
2 năm trước
Cho các oxit sau: Al2O3, BaO, HgO, SO2, CO, MgO, Fe3O4. Oxit nào tác dụng với: (viết PTHH) a) Nước b)KOH c)CO d)HCl
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II. Complete these sentences, using the past simple progressive or the past simple of the verbs in brackets. 1. Flight 201 (fly)…………………from London to New York when it suddenly (meet) ………………… a big storm and (drop) ……………………15 000 feet. The plane (carry) …………………… over 300 passengers and a crew of 17. 2. The doorbell (ring)……………………while Tom (watch)……………………TV. 3. How fast (you drive)……………………when the accident (happen)……………………? 4. Anna and Susan (make)……………………dinner when Martin (arrive)……………………home. 5. The light (go out)……………………while we (have)……………………dinner. But it (come) ……………………on again after about ten minutes. 6. What (you do)…………………at this time yesterday? – I (work)……………………on the computer. 7. It suddenly (begin)…………………to rain while Laura (sit)……………………in the garden. 8. I (walk)……………………on the street one day when someone (hit)……………………me in the back. I (turn)……………………round to find that it was my old friend

EX10. Chia động từ trong ngoặc ở thì hiện tại hoàn thành. Jim: Hi, Jane. How are you? What (1. you/ do) ______________recently? Jane: Oh, hi Jim. It (2. be)______________quite a long time since we last talked. Well, I (3. work)______________for a non-profit organization. We are carrying out a project to help homeless people in our neighborhood. Jim: That sounds very interesting. (4. You/ have)______________any difficulties? Jane: Of course! Basically my colleagues and I are doing charitable work, so we rarely receive any financial support. We (5. provide)______________free food for the homeless people since last week. Moreover, the organization (6. recently offer)______________ jobs for those people. Jim: It is a meaningful job. I really admire you! How long (7. you/ work)______________there? Jane: Since the start of our summer holoiday. How about you? What (8. you/ do)__________ this summer? Jim: Not much. I spend my whole day reading and reading. So far, I (9. already finish)______________three books. My mother (10. tell)______________me several times to go out and try something new but I (11. not find)______________anything that suits me. Jane: Uhm, let’s see. How about joining our organization? We (12. look)______________for new volunteers for weeks. The organization (13. also plan)______________to have some voluntary programs to help disabled children. You can join and read books for the kids.I think it’s quite suitable for you. Jjm: That’s a nice idea. I will definitely consider it. By the way, I (14. plan)__________to have a party with friends. Would you like to come? Jane: I’d love to. When will you hold the party? Jim: I (15. not decide)______________yet. But I will call you soon.

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