: Cho các phản ứng sau: 1)4HCl + MnO2 → MnCl2 + Cl2 + 2H2O 2)2HCl + CaOCl2 → CaCl2 + Cl2 + H2O 3)3HCl + Fe(OH)3 → FeCl3 + 3H2O 4)6HCl + 2Al → 2AlCl3 +

: Cho các phản ứng sau: 1)4HCl + MnO2 → MnCl2 + Cl2 + 2H2O 2)2HCl + CaOCl2 → CaCl2 + Cl2 + H2O 3)3HCl + Fe(OH)3 → FeCl3 + 3H2O 4)6HCl + 2Al → 2AlCl3 + 3H2 5)16HCl + 2KMnO4 → 2KCl + 2MnCl2 + 5Cl2 + 8H2O Trong các phản ứng trên, số … Đọc tiếp

Ex6: Simple past or prefect: 7. He (finish)=-.his work. He is having a smoke now. 8. She (lose)=…her bag in the train yeste

Ex6: Simple past or prefect: 7. He (finish)……………..his work. He is having a smoke now. 8. She (lose)……………her bag in the train yesterday. 9. Columbus (discover)……………………America more than 400 years ago. 10. I (not see)……………………….him for more than a month. 11. Since when you (know)…………………her ? 12. How long ago (be)………………………the second world war ? … Đọc tiếp