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Fe $S_{2}$ → $Fe_{2}$ $O_{3}$ → $H_{2}$ $SO_{3}$ ⇄ $FeSO_{4}$ → $Fe(NO_{3})_{2}$ ↓ ↓ Fe → $FeCl_{2}$ → $Fe(OH)_{2}$ → $Fe(NO_{3})_{3}$
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QUESTIONS 21 - 30: Rearrange the words to make a complete sentence. 21. how /that /wondered /to use / they /support service => _____________________________________________________________. (1 Điểm) 23.22. when /the oven /Mai / turn off/ to/ asked her mother => ______________________________________________________________. (1 Điểm) 24.23. could /where /bikes /Phong and Minh /not /park / decide /to/ their => ______________________________________________________________________________. (1 Điểm) 25.24. call /sure /whether /not /he /to /then / was /her => ______________________________________________________. (1 Điểm) 26.25. what /make / they /feel /do /Linh /happier /wondered /to /to => _____________________________________________________________________. (1 Điểm) 27.26. sign/ could/ me/ to/ you/ where/ my name/ tell/ ? => _________________________________________________________ (1 Điểm) 28.27. leave/ when/ no idea/ to/ for/ I / have/ the bus => _____________________________________________________. (1 Điểm) 29.28. hang/ to/ not/ painting/ we/ where/ are/ the/ sure => _________________________________________________________. (1 Điểm) 30.29. go/ they/ can/ who/ first/ not/ decide/ to => _______________________________________________. (1 Điểm) 31.30. how/ tell/ to/ this news/ wondered/ his parents/ to/ he => ________________________________________________________________. (1 Điểm)

11. We don't know where we should put the sofa. => _______________________________________________________. (1 Điểm) 13.12. The rules didn't specify who I should speak to in case of an emergency. => _________________________________________________________________________________. (1 Điểm) 14.13. Mai wondered how she could ride the scooter. => __________________________________________________. (1 Điểm) 15.14. Let us decide when we should start the project. => _______________________________________________________. (1 Điểm) 16.15. Could you tell me where I can find a good hotel? => _______________________________________________________? (1 Điểm) 17.16. We must find out what we are to do next. =>___________________________________________________. (1 Điểm) 18.17. A good dictionary tells you how you should pronounce the words. => ___________________________________________________________________________. (1 Điểm) 19.18. We are not sure who we will meet at the entrance. => _________________________________________________________. (1 Điểm) 20.19. I can't remember when I have to turn off the oven. => __________________________________________________________. (1 Điểm) 21.20. Do you know what you should look for? => ______________________________________________? (1 Điểm)

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