giúp bài này vs mình đang cần gấp

Giúp mình với nha các bạn cho 5 vote

Câu 8 *: Khi lắp máy lạnh trong phòng, vì sao người ta không lắp máy lạnh ở dưới thấp mà lại lắp trên cao gần trần phòng?

14. I ______ to New York three times this year. A. have been B. was C. were D. had been 15. I'll come and see you before I _______ for the States. A. leave B. will leave C. have left D. shall leave 16. The little girl asked what _______ to her friend. A. has happened B. happened C. had happened D. would have been happened 17. John ______ a book when I saw him. A. is reading B. read C. was reading D. reading 18. He said he _______ return later. A. will B. would C. can D. would be 19. Jack ________ the door. A. has just opened B. open C. have opened D. opening 20. I have been waiting for you ______. A. since early morning B. since 9 a. m C. for two hours D. All are correct 21. Almost everyone _______ for home by the time we arrived. A. leave B. left C. leaves D. had left 22. By the age of 25, he ______ two famous novels. A. wrote B. writes C. has written D. had written 23. When her husband was in the army, Mary ______ to him twice a week. A. was reading B. wrote C. was written D. had written

Câu 8. Lò xo có độ cứng k = 100 N/m ở trạng thái ban đầu không bị biến dạng . khi lò xo bị nén thì thế năng đàn hồi của hệ bằng 0,05J . độ nén lò xo bằng : A. 2mm B. 2cm C. 4cm D. 4m

Giúp mình giải bài này với, giải đúng giùm mình nha

rút ngắn lại rồi làm hộ mik nhóa Exercise 2: Read again and decide if each statement is true (T), false (F) or not given (NG). No. Statement T/ F/ NG 1. This seemed to be a high school. _____________ 2. The teachers also took part in the Sports Day as participants. _____________ 3. The author’s class was divided into four teams. _____________ 4. There were not any individual events in this Sports Day. _____________ 5. The Day was marked with prize-giving ceremony. _____________ 6. Everybody didn’t enjoy the Day too much as they were so tired. _____________

What about buying energy-saving bulbs? Shall_________________________________________

thu gọn biểu thức {-1/3.x^2.y}.{-2/3.xy^3}.{1.1/2.xy^2}

Giúp mk vs mk sẽ vote 5 sao cho các bạn .cám ơn