Hỗn hợp khí X gông O2 và O3 có tỉ khối hơi so với oxi là 1,3. - Tính % khối lượng của mỗi khí trong hỗn hợp. - Cho 20,8 gam hỗn hợp X có thể đốt cháy hoàn toàn bao nhiêu gam benzen(C6H6)

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I. Choose the words whose underlined part is pronounced differently from that of the others in each group 1. A. soon B. see C. sure D. sorry 2. A. amazing B. orange C. table D. favorite 3. A. country B. journalist C. younger D. countryside 4. A. game B. arrange C. skate D. cake 5. A. hobby B. doll C. collect D. for 6. A. difficult B. unusual C. uncle D. result 7. A. piano B. fish C. like D. badminton 8. A. rest B. help C. garden D. identify 9. A. heard B. pearl C. heart D. earth 10. A. button B. circus C. suggest D. future 11. A. sofa B. away C. banana D. occasion 12. A. light B. fine C. knife D. principle 13. A. farm B. card C. bare D. marvelous 14. A. both B. bottle C. Scotland D. cotton 15. A. wash B. wear C. wake D. wrap 16. A. sick B. swimming C. itchy D. riding 17. A. really B. healthy C. regularly D. identify 18. A. bad B. tall C. dad D. sad 19. A. although B. enough C. paragraph D. cough 20. A. traditional B. essential C. audition D. picture 21. A. attract B. actor C. guitarist D. gallery 22. A. delicious B. special C. musical D. physician 23. A. answer B. further C. butter D. birth 24. A. burn B. collect C. alone D. neighbour 25. A. chimpanzee B. mechanic C. chemistry D. earache 26. A. of B. funny C. wife D. bookshelf 27. A. conquer B. cook C. centimeter D. key 28. A. pork B. support C. perform D. information 29. A. tuna B. tutor C. tofu D. unusual 30. A. purity B. burning C. cure D. durable 31. A. see B seen C. sportsman D. sure 32. A. pull B. sugar C. plural D. study 33. A. course B. court C. encourage D. cough 34. A. bark B. share C. dare D. bare 35. A. cotton B. bottle C. cold D. common 36. A. dear B. hear C. bear D. clear 37. A. bury B. curtain C. burn D. turn 38. A. folk B. work C. pork D. corn 39. A. shout B. sugar C. share D. surgery 40. A. about B. amount C. should D. ground