Tìm các chất+ `X_1;X_2;X_3;....` thích hợp hoàn thành các phản ứng sau: 1, `Fe_2O_3+CO->Fe_xO_y+X_1` 2, `X_2+X_3->BaSO_4\downarrow+Na_2SO_4+CO_2\uparrow+H_2O` 3, `X_2+X_4->BaSO_4\downarrow+Na_2SO_4+CO_2\uparrow+H_2O` 4, `X_5+X_6->Ag_2O\downarrow+KNO_3+H_2O` 5, `X_7+X_8->Ca(H_2PO_4)_2` 6, `X_9+X_10->Fe_2(SO_4)_3+SO_2\uparrow+H_2O` `X_9^1+X_10->Fe_2(SO_4)_3+SO_2\uparrow+H_2O` `X_9^2+X_10->Fe_2(SO_4)_3+SO_2\uparrow+H_2O` `X_9^3+X_10->Fe_2(SO_4)_3+SO_2\uparrow+H_2O` `X_9^4+X_10->Fe_2(SO_4)_3+SO_2\uparrow+H_2O` `X_9^5+X_10->Fe_2(SO_4)_3+SO_2\uparrow+H_2O` 7, `X_10+X_11->Ag_2SO_4+SO_2\uparrow+H_2O` 8, `X_3+X_12->BaCO_3\downarrow+H_2O` 9, `X_3+X_13->BaCO_3\downarrow+CaCO_3\downarrow+H_2O` 10, `X_9+X_14->Fe(NO_3)_2+X_15`

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Exercise 1: Cho dạng đúng của các động từ trong ngoặc 1. I thanked her for everything she (do)____________for me. 2. Alan ___________hardly _____________(prepare) for dinner when her husband went home 3. Dan_______________two tablets this year. (already/ buy) 4. How many games_____________your team ____________ so far this season? (win) 5. ____________ you __________your homework yet? (do) 6. I_____________Peter since I arrived last Tuesday. (not/ see) 7. They went home after they (finish) ___________________their work. 8. She said that she (already, see) __________________Dr. Rice. 9. After Peter (take)_______________ a bath, he went to bed. 10. He told me he (not/eat) ________________such kind of food before. 11. When he came to the stadium, the match (already/ begin) _________________. 12. Before she watched TV, she (do)_________________ homework. 13. After they (go)_______________, I sat down and rested. 14. Yesterday, John (go) _____________to the store before he went home. 15. No sooner ___________I (watch)____________ TV than the phone rang. 16. Before I watched TV, I (do) ________________my homework. 17. After I (wash)______________ my clothes, I went to sleep. 18. It is the first time I ______________ (eat) sushi 19. She didn’t notice that she (never see) ______________that film before. 20. I suddenly remember that I __________________ (forget) my keys. Exercise 2: Cho dạng đúng của các động từ trong ngoặc A. PRESENT CONTINUOUS: 1. Hannah __________________ (not study) French in the library. She________ (be) at home with her classmates. 2. My kids (be)____________downstairs now. They (play)_____________chess. 3. While I (do)____________my homework, my sister (read) __________ newspapers. 4. She normally ____________ (live) in Northbridge but she _________________ (stay) with friends at the moment. 5. What sort of clothes _______ teenagers ________ (wear) nowadays? What sort of music _______ they __________( listen) to? 6. Paul and Sally___________ (have) had an argument they __________________ (speak) to each other. 7. You ____________ (make) a lot of noise. Can you be quieter? I _____________ (try) to concentrate. 8. Kate phoned me last night. She is on holiday in France. She__________ (have) a great time and ___________( not, want )to come back. 9. Tommy (clean) _______ his house and his father (repair) _______ their old car at the moment. 10. I (read) _________ this book but my sister (not read) __________ now.

GIÚP E VS Ạ UNIT 11 1. Cuc Phuong National Park is ________________ 160 km South West of Hanoi. (location) 2. It is the first of Vietnam's nine national parks to be established and it ________________ over 200 square km of rainforest. ( contain ) 3. Nairobi National Park is Kenya's smallest park, but you may be ________________ at the large variety of animals that live there. (surprising) 4. An interesting feature of this park is the Orphanage where lots of orphaned or ________________ animals are taken care of. (abandon) 5. This ________________ has threatened the park and many of the animals in it. (contaminate) 6. This contamination has _______________ the park and many of the animals in it. (threat) 7. What do you think will happen to the park if more chemicals are ________________ into the water? (releasing) 8. Visitors, especially children, can go there to learn how to recognize the ________________species of animals and plants. (difference) 9. This national park is special because it has plants and animals from both ________________ and temperate zones. (tropically) 10. His father was working ________________ at national park (industrious) 11. Inflation figures have fluctuated _______ between 0.2% and 25% (wild) 12. For a goalkeeper, it's a great _______ to have big hands. (advantageous) 13. She first rose to _______ as a singer at the age of 16. (famous) 14. Such data will prove _______ for researchers (valued) 15. Dolphins are a _______ species (protectively) II. TENSES Exercise 1: Cho dạng đúng của các động từ trong ngoặc 1. I thanked her for everything she (do)____________for me. 2. Alan ___________hardly _____________(prepare) for dinner when her husband went home 3. Dan_______________two tablets this year. (already/ buy) 4. How many games_____________your team ____________ so far this season? (win) 5. ____________ you __________your homework yet? (do) 6. I_____________Peter since I arrived last Tuesday. (not/ see) 7. They went home after they (finish) ___________________their work. 8. She said that she (already, see) __________________Dr. Rice. 9. After Peter (take)_______________ a bath, he went to bed. 10. He told me he (not/eat) ________________such kind of food before. 11. When he came to the stadium, the match (already/ begin) _________________. 12. Before she watched TV, she (do)_________________ homework. 13. After they (go)_______________, I sat down and rested. 14. Yesterday, John (go) _____________to the store before he went home. 15. No sooner ___________I (watch)____________ TV than the phone rang. 16. Before I watched TV, I (do) ________________my homework. 17. After I (wash)______________ my clothes, I went to sleep. 18. It is the first time I ______________ (eat) sushi 19. She didn’t notice that she (never see) ______________that film before. 20. I suddenly remember that I __________________ (forget) my keys