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Viết PTHH hoàn thành sơ đồphản ứng sau:a)S )1(SO2)2(Na2SO3)3(SO2)4(H2SO3)5(K2SO3)6(K2SO4b)CaO )1(Ca(OH)2)2(CaCO3)3(CaO )4(CaCl2 giúp tớ vs :<

Staff nghĩa là nhân viên, mang nghĩa nhiều người + V số nhiều Vậy staffs có nghĩa gì khác ạ, và vẫn + V số nhiều đúng ko ạ

Exercise 1 ( ON STRUCTURES) : Choose the best answer. 1. We _______ a campaign to fight world hunger. A. launched B. sent C. jumped D. lost 2. We used to be friendly _______ some people who worked at the Swedish Embassy. A. on B. about C. of D. with 3. The school sees its job as preparing students to _______ a contribution to society. A. bring B. show C. make D. say 4. As a move towards _______ green I’ve recently stopped providing plastic bags for my customers. A. going B. thinking C. breaking D. setting 5. We haven’t got any sugar, I used _______ the last of it when I made a cake. A. from B. out of C. down D. up 6. I can’t wait to _______ rid of that ugly old couch. A. grow B. get C. follow D. catch 7. I’ve been meaning _______ see that new movie everyone is talking about. A. to B. at C. by D. through 8. Researchers may be unaware _______ their uncritical acceptance of categories and consequent results. A. up B. as C. of D. in 9. He was economical with the truth. In other _______ he lied. A. names B. comments C. words D. news 10. "Mental handicap" should be replaced _______ the broader concept of "learning difficulties". A. with B. about C. through D. around 11. _______ conclusion, I would like to say how much I have enjoyed myself today. A. In B. From C. Upon D. Onto 12. Mr. Warshaw, who specialises exclusively in conservation work says the _______ benefits are both financial and aesthetic. A. near B. straight C. open D. immediate 13. The car slowed _______ when they saw the police. A. up B. behind C. next D. down 14. Drunken drivers _______ a serious threat to other road users. A. pose B. sit C. play D. create 15. Dinosaurs died _______ millions of years ago. A. of B. through C. out D. by 16. Whole villages have been ______ by the floods. A. turned down B. wiped out C. urged on D. lit up 17. When Fran moved to China, she struggled to adapt _______ her new surroundings. A. about B. from C. to D. with 18. I resent it that my job is starting to _______ on my family life. A. eat B. break C. carry D. encroach 19. Sets out an _______ plan, with practical advice on managing changing demand at the neighbourhood level. A. action B. acting C. active D. actinium 20. People should _______ green lifestyle to help conserve the natural resources. A. adopt B. adapt C. adjoin D. adjust 21. New sites for _______ disposal will be determined to have regard to environmental matters. A. bare B. remaining C. waste D. fallow

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6.Tính Phân tử khối của các chất sau: O3, H3PO4, Al2(SO4)3, FeSO4,7H2O, Ba(HCO3)2, Mg(H2PO4)2.

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