Người ta kéo 1 thùng hàng nặng 100kg lên độ cao 10m. Tính công thực hiện được trong trường hợp này? Giúp mình với ạ

1. She is cooking lunch now.  2. They usually send me e-mails.  3. They don’t open the windows.  4. Does your sister often help you?  5. Are they cleaning the floor now?  6. My father usually waters the plants and flowers in the late afternoon.  7. They have proved that there is no life on the moon.  8. You can buy video like this one anywhere.  9. They fought the battle in 1623.  11. Rachel will give you some advice.  12. The police officer showed us the way.  13. They have written her a postcard.  14. They did not offer her a seat.  15. When did people build that museum?  16. How many languages do people speak in Canada?  17. We are going to grow flowers in the front garden.  18. Will you post this letter on the way to work?  19. The cashier used to do the accounts.  20. Nobody has invited her to the party.  EXERCISE 9. Complete the sentences by choosing the best words 1. ‘Ms. Jones, please type those letters before noon.’ – ‘ They’ve _____, sir. They’re on your desk.’ A. already typed B. already been typed C. been already typed D. already being typed 2. Is the new computer system _____________ next month? A. being installed by people B. be installed C. being installed D. been installed 3. Last night a tornado swept through Rockville. It ___________ everything in its path. A. was destroyed B. was being destroyed C. destroyed D. had been destroyed 4. I think you should _____________. A. have your hair cut B. have your hair be cut C. cut your hair D. have your hair been cut 5. The first question must ___________ before you attempt the others. A. have answer B. answer C. to answer D. be answered 6. The police found two children in the forest. A. Two children are found by the police in the forest. B. Two children found the police in the forest C. Two children were found in the forest by the police. D. Two children was found by the police in the forest. 7. These mechanics are going to repair our car this afternoon. A. Our car are going to be repaired by these mechanics this afternoon. B. Our car is going to repair these mechanics this afternoon. C. We are going to get these mechanics repair our car this afternoon. D. We are going to get our car repaired by these mechanics this afternoon. 8. The passage _______________ out loud. A. has been read B. have been read C. have been readed D. has read 9. The parcel _____________ to him before his birthday. A. will be sent B. will be sented C. will be send D. will been sent 10. Had someone delivered the package before you got to the office? A. Had the package delivered to you before you got to the office? B. Had the package been delivered to you before you got to the office? C. Had the package been delivered to you by someone before you got to the office? D. Had the package been delivered you before you got to the office? 11. They put out all the candles that _____. A. had be lit B. had been litted C. had been lit D. has been lit 12. My bank loan _____ in five years time. A. will be payed off B. will be paid off C. will be paying off D. will paid off 13. _____ to you yet? A. Have the books been given back B. Have the book been give back C. Have the book been gave back D. Have the book being given back 14. They have to hold the meeting in this narrow room. A. The meeting had to be hold in this narrow room. B.The meeting has to be hold in this narrow room. C.The meeting has to be holded in this narrow room D. The meeting has to be held in this narrow room. 15. They showed his photograph on television. A. On television they had his photograph shown. B. His photograph was shown on television. C. His photograph is being shown on television D. The television was shown his photograph.

Giải giùm em bài toán với ạ 🙏 😭 Em đang cần gấp

Cho 50g CaCO3 tác dụng vừa đủ với dung dịch HCl 20%(d=1,2g/ml). Tính khối lượng dung dịch HCl đã dùng?

Câu 1: Ở Việt Nam, các dân tộc có A. 45 dân tộc B 54 dân tộc. C. 43 dân tộc D. 53 dân tộc Câu 2: Nghề thủ công của các dân tộc Thái, Tày là. A. Làm đồ gốm. B. Dệt thổ cẩm. C. Khảm bạc. D. Trạm trổ. Câu 3: Nét Văn hóa riêng của mỗi dân tộc được thể hiện ở những mặt. A. Ngôn ngữ, trang phục, phong tục tập quán. B. Kinh nghiệm lao động sản xuất, ngôn ngữ. C. Các nghề truyền thống của mỗi dân tộc,trang phục. D. Ngôn ngữ, trang phục, đia bàn cư trú. Câu 4: Dân số đông và tăng nhanh gây ra hậu quả. A. Sức ép đối với kinh tế, xã hội và môi trường. B. Chất lượng cuộc sống của người dân giảm. C. Hiện tượng ô nhiễm môi trường gia tăng. D. Tài nguyên ngày càng cạn kiệt, xã hội bất ổn.

K cần giải thich nhé mn, nhanh giúp mk.

Câu 3. Anh/chị hiểu nội dung hai dòng thơ sau như thế nào ? Mẹ ngồi vá áo trước sân Vá bao mong ước tay sằn mũi kim

1. All the students __________________ for their behavior tomorrow morning. (punish) 2. The problem __________________ at the meeting yesterday. (solve) 3. Electricity __________________ while we were having dinner last night. (cut) 4. All the pills __________________ next week. (pay) 5. My house __________________ by a skillful painter for three days, (paint) 6. The bicycle __________________ on my way to school. (repair) 7. Cars may __________________ here free of charge. (park) 8. Carpets __________________ every month to make sure it is clean enough. (clean) 9. Since their arrival, we __________________ excited. (make) 10. The doctor __________________ in a car accident last week. (hurt)

Every year, thousands of people come to Edinburgh, the capital city of Scotland, to be part of the Edinburgh Festival. For three weeks, every August and September, the city is filled with actors and artists from all over the world. They come to Edinburgh for the biggest arts festival in Britain. During this time, the streets of the city are alive with music and dance from early in the morning until late at night. You can even see artists painting pictures on the streets! Tens of thousands of tourists come to the Festival to see new films and plays and to hear music played by famous musicians. This year, you can see over five hundred performances with actors from more than forty countries. The tickets for these performances are quite cheap, and it is usually easier to see your favourite star in Edinburgh than it is in London, so come to Edinburgh next summer. 1. Edinburgh is the capital of Scotland. A. Right B. Wrong C. Doesn't say 2. The Edinburgh Festival is a month long. A. Right B. Wrong C. Doesn't say 3. The Edinburgh Festival is in October. A. Right B. Wrong C. Doesn't say 4. Actors come to the Edinburgh Festival from lots of different countries. A. Right B. Wrong C. Doesn't say 5. You can hear music all day. A. Right B. Wrong C. Doesn't say 6. Edinburgh Festival is the biggest festival in Great Britain. A. Right B. Wrong C. Doesn't say 7. The artists on the streets only paint pictures of scenery. A. Right B. Wrong C. Doesn't say 8. More than ten thousand students come to the Edinburgh Festival every year. A. Right B. Wrong C. Doesn't say 9. It is expensive to go to the theatre in Edinburgh. A. Right B. Wrong C. Doesn't say 10. It is usually more difficult to see famous actors in London than in Edinburgh. A. Right B. Wrong C. Doesn't say

Dẫn 4,48 l khí H2S(đktc) vào trong 250ml dung dịch KOH. Tính nồng độ mol của các chất sau phản ứng. Coi thể tích dung dịch thay đổi không đáng kể