Dẫn từ từ 8,4g hỗn hợp X gồm but-1-en và but-2-en lội chậm qua bình đựng dung dịch Br2,khi kết thúc phản ứng thấy có 24 gam brom phản ứng Xác định thành phần phần trăm khối lượng but-1-en và but-2-en có trong hỗn hợp X

trong lịch sử phát triển xã hội loài người, hình thái kinh tế xã hội nào có nền dân chủ cao nhất Vì sao

Cho 5,6g Fe tác dụng với O2 thu được Fe3O4.Tính khối lượng Fe3O4 thu được và tính thể tích của ko khí cần để đốt.

Giúp em bài này với ạ.Giải và ghi chi tiết giùm em

Làm thật chi tiết spam mình báo mod

Bài 4: Một ô tô đi từ A đến B mất 2 giờ. Một xe máy đi từ B về A hết 3 giờ. a) Tính quãng đường AB biết vận tốc ô tô hơn vận tốc xe máy 20km/giờ. b) Nếu hai xe khởi hành cùng một lúc thì chúng gặp nhau cách A bao nhiêu ki-lô-mét? Bài 5: Một xe máy dự định đi từ A đến B mất 4giờ. Nếu xe máy tăng tốc thêm 5km/giờ thì đi từ A đến B chỉ mất 3 giờ 30 phút. Tính quãng đường AB.

15. You ……………. disturb him during his work! A. should not B. could not C. must not D. don't have to 16. The windows look clean. You ……………… wash them. A. mightn’t B. can't C. don't have to D. mustn't 17. Sue: “You are a great dancer. I wish I could do half as well as you” - Daisy: “_____.” A. I'm fine, thanks B. Not at all C. I don’t think so, too D. You’ve got to be kidding! I thought it was terrible 18. Sorry, I can’t stop now. I _____ to an important meting. A. am going to go B. am going C. go D. will go 19. There are several places where residents face the threat of _______ every day. A. terrorize B. terrorist C. terror D. terrorism 20. Mary: “That’s a very nice skirt you’re wearing.”- Julia: “_________.” A. That’s all right B. That’s nice C. I like it D. I’m glad you like it 21. The GCSE stands for __________. A. the Generous Certificate of Secondary Education B. the General Certificate of Secondary Education C. the Grade Curriculum of Secondary Education D. the Government Curriculum of Secondary Education 22. Many Indian men said that it was unwise to ______ in their wives. A. trust B. share C. confide D. hide 23. He was offered the job thanks to his ____ performance during his job interview. A. impressive B. impress C. impressively D. impression 24. Nam: “Would you like to have dinner with me?” - Lam: “__________.” A. Yes, it is B. Yes, so do I C. I’m very happy D. Yes, I’d love to 25. “If I were you, Tom, I wouldn’t meet Jane again.” said Anna A. Anna advised Tom not to meet Jane again. B. Anna offered Tom not to meet Jane again. C. Anna advised Tom to meet Jane again. D. Anna invited Tom to meet Jane again.

4/ Em hiểu như thế nào về hình ảnh “ đường vàng” ở khổ thơ thứ ba?( trả lời bằng 2-3 câu văn) GIÚP MK NGAY ĐC KO MK ĐANG VỘI NHANH LÊN ! PLEASE

Put the verbs in the brackets in the correct form of tense. 1. My uncle (just/ open) …………………………… a new internet shop on Trang Tien street. 2. ………… Linh (watch) ……………..……… TV at 9 o’clock last night? 3. While Mr Brown (work)………..…….….. in the garden, his wife (cook) ………………… 4. Nam (not buy)………..… a new computer since he (sell) ……………. the old one last month. 5. ……… Mr Phong (go) ……………. to New York for ten days last year? 6. Last year we (install) ………… ordinary light bulbs, but now we (use) ...………… new ones. 7. When I (arrive)……….... at her house yesterday, she (do) ……………….. her homework. 8. He (be) ………………..….very successful in his business since he (come) ……..……..here. 9. London …………………. (have) a population of eight million people. 10. We …………………... (visit) Sydney Opera House for several times. 11. I rarely (go) …………… out in the evening, but Mary often (go) …………. out with her friends in the evening. 12. It (often/ not/ rain) …………….. in the dry season. 13. Look! The girl (dance) ………… and the boy (sing) ………….. very beautifully. 14. I (call) …………… Mr Wilson at 9 last night, but he (not/ be) …………… at home. He (study) ……………….. at the library. 15. Ten years ago, the government (decide) …………….. to begin a food programme. At that time, many people in the rural areas (starve) ……………… due to several years of drought. 16. This morning (be) …………….. very wonderful. The Sun (shine) ………………. the birds (sing) ………………. beautifully. I (go) …………… to the shop to buy some flowers to present for my closest friends. 17. What ………. she (do) ………….. now? – She (clean) ………………. the floor. 18. I (not/ hear) ………………… the thunder during the storm last night because I (sleep) ………………… 19. The Sun (rise) ……………. in the East and (set) ……………….. in the West. 20. Linda is working in thisdepartment. She (work) …………….. here for two years. giúp mik với,plss

Question I. Choose the best answer. (A,B, C or D ) 1. I like ______________ back my home village on holiday. A. comes B. come C. came D. coming 2. If the factory ________________ dumping poison into the lake, all the fish and other aquatic animals will die. A. continues B. to continue C. continued D. will continue 3.Water ________________ in the lake has made the fish die. A. pollution B. pollute C. polluted D. polluting 4. Mi and Nick like ______________ back Mi’s home village on holiday. A. comes B. come C. came D. coming 5. If the factory continues dumping poison into the lake, all the fish and other aquatic animals A. die B. to die C. dead D. will die 6. Water pollution is the ________________ in the lake has made the fish die. A. contaminating B. contaminate C. contaminated D. contamination 7. If we ______________ water carefully, more people will have fresh water. A. will use B. would use C. using D. use 8. If the factory continues dumping poison ________________ the lake, all the fish and other aquatic animals will die. A. into B. to C. about D. in