1. Tell types of pollution? What should reduce air and water pollution? 2. Tell types of disaster in Viet Nam? 3. Tell about forms of communicatinon. What should/shouldn't you do when comuniating online? 4. Tells some benefits of science and technology in our life? Giúp mình nha (=￣ω￣=)

Cho tam giác ABC vuông tại A, biết cạnh AB = 9cm, cạnh AC = 12cm, phân giác AD (D thuộc BC ). Tính độ dài cạnh BC,DB và DC.

Em hiểu như thế nào về cách mạng tư sản thời cận đại

nêu sự khác nhau giữa virut và vi khuẩn

tinh bang cach thuan tien 2phan3 nhan 4phan9 cong 2phan3 nhan 5phan9

nêu cấu tạo ngoài của bồ câu? vì sao bồ câu bay được

từ năm 1930 đến 1945 cuộc đấu tranh giải phóng dân tộc của nhân dân việt nam trải qua giai đoạn cách mạng lớn nào?giai đoạn nào đã mở ra kỉ nguyên mới cho dân tộc vieeth nam?giải thick tại sao

Một nhà văn nói:"sách là ngọn đèn sáng bất diệt của trí tuệ con người ".Hãy giải thích nội dung câu nói đó. Giải giúp e vs ạ Mấy cj ko chép mạng ạ. E C. Ơn trc

11. Playing ball in the classroom was a bad idea, boys. You could ________ a window. A. broke B. have been breaking C. be breaking D. have broken 12. The robber was made ________ where he had hidden the money. A. to confess B. confess C. confessing D. to confessing 13. We saw the girls ________ football as we drove past the field. A. play B. to playing C. to play D. playing 14. Don’t you know that you ________ put that watch in water? It’s not waterproof. A. don’t have to B. mustn’t C. didn’t need to D. needn’t 15. ________ you tell me how much this costs? A. May B. Would C. Might D. Had better 16. Neither Julie nor Sue ________ to work today because they are both ill. A. are going B. isn’t going C. aren’t going D. is going 17. If you require any ________, please contact my secretary. A. further information B. further informations C. farther information D. farther informations 18. The ________ we work out, ________ we become. A. most … the fitter B. more … the more fitter C. more … the fitter D. more … the fittest 19. ________ we arrived late, we didn’t miss the speech. A. Despite B. In spite of C. Even though D. However 20. That’s the artist ________ paintings are very fashionable. A. whose B. which C. who D. Ø 21. Can you tell me ________? A. how much does this sweater cost B. how much this sweater costs C. what does this sweater cost D. how this sweater costs 22. No one asked for me while I was out, ________? A. did he B. didn’t he C. did they D. didn’t they 23. ________ the room, I noticed it had been renovated. A. Entering B. Entered C. Having been entered D. Having entering 24. At no time ________ the house. A. left they B. did they leave C. they left D. they did leave 25. Cars ________ in Japan are very reliable. A. having manufactured B. have been manufactured C. manufacturing D. manufactured 26. Here are your photos. We ________ at the photographer’s. A. got them developed B. develop them C. got developed them D. got them develop 27. Sue ________ by the police all night. A. was being questioned B. was questioning C. is being questioned D. had questioned 28. I’ll lend you my car ________ you promise to drive carefully. A. in case B. unless C. as long as D. even if 29. Have you ever really ________ up to your parents? A. spoken B. reached C. worked D. stood 30. The blueprint for the Boutique hotel includes 200 guest rooms, a restaurant, and an ________ parking area. A. enclosed B. opposite C. absent D. innocent

Cho 3,7g một ancol X no đơn chức mạch hở tác dụng với natri vừa đủ thấy có 0,56 lít khí thoát ra. a.Lập CTPT X, b.Khi axihoa X thì thu được Xeton, xđ CTCT đúng của X.