1. Cho một thể tích không khí (chứa 20% oxi và 80% nitơ về thể tích) cần thiết đi qua bột than đốt nóng, thu được khí than A chỉ chứa $CO$ và $N_2$. Trộn khí than này với một lượng không khí vừa đủ để đốt cháy hết $CO$, ta được hỗn hợp khí B. Đốt cháy hỗn hợp khí B, thu được hỗn hợp khí C trong đó $N_2$ chiếm 77,108% về thể tích. Tính hiệu suất phản ứng đốt cháy $CO$. 2. Cho dung dịch A chứa hai axit: $HCl$ $2M$ và $H_2SO_4$ $2M$ Thí nghiệm 1: Cho m gam $Fe$ tác dụng với $200ml$ dung dịch (A) thu được $8,96l$ khí $H_2$ Thí nghiệm 2: Cho m gam $Fe$ tác dụng với $400ml$ dung dịch (A) thu được $11,2l$ khí $H_2$ a) Chứng tỏ rằng thí nghiệm 1 axit hết và $Fe$ dư; còn thí nghiệm 2 axit dư và $Fe$ hết b) Tìm m c) Khối lượng muối nằm trong giới hạn nào?

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14. be / cool / will / and / windy / it. ......................................................................................................................................... 15. where / go / did / weekend / you / last? ......................................................................................................................................... 16. Phu Quoc / I / to / Island / went. ......................................................................................................................................... 17. do / of / think / it / you / What? ......................................................................................................................................... 18. expected / beautiful / than / It’s / more / I ......................................................................................................................................... 19. Phu Quoc / go / next / to / I’ll / Island / year. ......................................................................................................................................... 20. I / Ha Nam / village / in / a / in / live / small. ......................................................................................................................................... 1. in / peaceful / hometown / quiet / and / my / life / is. ........................................................................................................................................ 22. friendly / are / villagers / the / kind / and. ......................................................................................................................................... 23. noisy / Ha Noi / is / busy / and. ......................................................................................................................................... 24. than / Ha Noi / more / Ha Nam / crowded / is ......................................................................................................................................... 25. would / like / what / you / eat / to? .........................................................................................................................................

a. bowl b. cup c. sweet d. bunch 2. a. activity b. season c. weather d. like 3. She …… doing aerobics now. A. are B. does C. is D. has 4. George …… before he goes to school. A. usually is swimming B. is usually swimming C. usually swims D. swims usually 5. ………………..bowls of rice do you eat? A. How often B. How many C. How much D. How far Use these words to make a complete sentence. There is one example. (1point) 1. It/ cold/ foggy/tomorrow. ......................................................................................................................................... 2 do/ of/ what/ think/ you/ Ha Long Bay/ ? …………………………………………………………………………………………. 3 There/ two/ seasons/ south/ Viet Nam. .......................................................................................................................................... 4 Which / place/ like/ you/ Ha Long Bay/ Ba Na Hill? ......................................................................................................................................... 5 Sara/ more/ thinks/ Dam Sen Park/ exciting / than/expected. ......................................................................................................................................... 6. a / I’d / an / sandwich / apple, / please / and / like. ......................................................................................................................................... 7. do / eat / you / sausages / every / day / many / how? ......................................................................................................................................... 8. you / how / drink / do / day / every / water / much? ......................................................................................................................................... 9. bottles / five / water / of / a / drink / day / I. ......................................................................................................................................... 10. are / seasons / there / in / four / country / my. ......................................................................................................................................... 11. autumn / what’s / Hai Phong / like / in? ......................................................................................................................................... 12. usually / dry / it’s / cool / and. ......................................................................................................................................... 13. will / what / like / weather / be / the / tomorrow? .........................................................................................................................................