1. Hòa tan hoàn toàn hỗn hợp Z gồm Cu và CuO trong dung dịch HNO3 loãng dư thu được 0,896 lít NO (đkc) là sản phẩm khử duy nhất và dung dịch chứa 37,6 gam Cu(NO3)2. Tính % khối lượng của Cu trong Z. 2. Hòa tan hoàn toàn 14,08 gam hỗn hợp X gồm Cu và CuO bằng dung dịch HNO3 30% (lấy dư) thu được dung dịch Y và thoát ra 1,792 lít khí NO (đktc, là sản phẩm khử duy nhất). Biết lượng HNO3 dùng dư 20% so với lượng vừa đủ, tính khối lượng CuO và m dd HNO3

8.Our customs is to take off hats before going into the house We have the custom_____ 9.You shouldn't touch another person's head because it's disrespecful It's disrespecful for __________ help

giúp mình với bạn ơi giải hộ mình nhé

60đ ..................... làm giúp mk nha đúng nhất cho tlhn và 5 sao , cảm ơn

Giúp ajaaaaaaaaaaaaaaaaaaaaaaaaa Giải hệ phương trình ngắn thôi

3. Paul tried to solve the problem ______ the noise and interruptions outside. A. because of B. in spite of C. in case of D. according to 4. Mr. Black: “I’d like to try on these shoes, please.” Salesgirl: “______” A. I’d love to. B. By all means, sir. C. Why not? D. That’s right, sir. 5. By the age of 34, my brother ………… his own business. A. started B. has started C. had started D. would start 6. You’d better stop spending money, _______ you will end up in debt A. unless B. otherwise C. if D. in case 7_______________ trying to make him change his mind. A. It’s no point B. It’s no hope C. It’s useless D. It's no use 8. It’s time you __________ home now Go went to go going 9. This is such an important question that we can’t _________________thinking it over. A. point B. use C. help D. stand 10. We agreed _____ together. A. working B. to work C. worked D. to working 11. She refuses_____ to her mother A. listen B. to listening C. to listen D. listening 12. The criminal admits ______ the money. A. to taking B. take C. to take D. taking 13. The students in this class were made _____ very hard. A. learn B. to learn C. learning D. having learnt 14. You ...................... your new hat when I ...................... you yesterday. A. were wearing/ had met B. wore/ had met C. wore/ was meeting D. were wearing/ met 15. I felt quite _______ with my day’s work. A. satisfy B. satisfactory C. satisfied D. satisfaction 16. I remember ___________him said that he would come but he is absent now. A hear B to hear C hearing D heard 17. .................... bag are you carrying? ~ Judy′s. a. Which b. What c. who’s d. Whose 18. The founding of the Radium Institute in 1914 made Marie Curie's __________wish come true. A. human B. humanity C. humanitarian D. humanely 19. He plays football ________ though he is not a football player. A. professionally B. professional C. unprofessionally D. professor 20. Never___________ the exact cause of earthquakes. a. scientists discovered b. did scientists discovered c. does scientists discover d. have scientists discovered 21. “ Do you want me to help you with those suitcases?” “_________” A. Of course, not for me. B. No, I can’t help you now. C. No, those aren’t mine. D. No, I can manage them myself. 22. “Your boss looks like the aggressive type.” “__________” A. Yes, he really wants to get ahead. B. Yes, he’s quite gentle. C. Really? I’ve never seen him lie. D. Right. He ‘s so quiet. 23. I remember -------------- my mother said the grass in the garden needed --------------. A. to hear/cutting B. hear/cut C. heard/to cut D. hearing/ cutting 24. Did you accuse Nam of -------------- a plate? Well, I saw him -------------- it off the table with his elbow. A. break/ knock B. breaking/ knocking C. to break/ to knock D. breaking/ knock 25. We regret -------------- you that we cannot approve your suggestion. A. inform B. to inform C. informing D. informed

rút gọn biểu thức với a≥0; b≥0; a≠b

em can gap aaaaaaaaaaaaaaaaaaaaaaaa

I.complete the second sentences so that it means the sames as the first one 7.They will probably travel to japan to experience japanese life style They might_____

hhhhhhhhhhheeeeeeeeeeeelllllllppppppppppp