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Thể tích ở đktc của hỗn hợp gồm 6.4g Oxi và 22,4g nitơ là bao nhiêu

22. She is buying a lot of food. She ………….. a birthday party for her child tomorrow. a. will prepare b. prepares c. is going to prepare d. prepared 23. Today, His father ………. a meeting with his colleagues at 9.30. a. is having b. is having c. has d. will have 24. They last visited me five years ago. .a. They haven't visited me for a long time. c. I haven't been visited for a long time. b. They have known me for five years. d. They haven't visited me for five years. b. They have known me for five years. d. They haven't visited me for five years. 25. I haven't visited the museum for three months. a. It is three months since I have visited the museum. b. I visited the museum three months ago. c. The last time I had visited the museum was three months ago. d. It is three months since I last visited the museum. 26. The last time I saw Rose was three years ago. a. I didn’t see Rose for three years. b. I haven’t seen Rose three years ago. c. I haven’t seen Rose since three years. d. I haven’t seen Rose for three years. 27. It’s a long time since we last went to the cinema. a. We have been to the cinema for a long time. b. We haven’t been to the cinema for a long time. c. We don’t go to the cinema as we used to. d. We wish we went to the cinema now. 28. John began playing the piano 10 years ago a. John played the piano 10 years ago. c. John has played the piano for 10 years. b. John used to play the piano 10 years ago. d. John doesn't play the piano anymore 29. Mike turned off the light, then he went to bed. a. Before Mike went to bed, he had turned off the light. b. Before Mike turned off the light, he had gone to bed. c. After Mike had gone to bed, he turned off the light. d. Mike turned off the light as soon as he had gone to bed. 30. Someone knocked the door during our dinner. a. When we are having dinner, someone knocked the door. b. When we were having dinner, someone knocked the door. c. Before we had dinner, someone had knocked the door. d. we had dinner, while someone was knocking the door.

nếu cho zn tác dụng với hcl và h2so4 có cùng số mol thì oxit nào cho nhiều khí hơn

Giúp mình với mình đang cần gấp

Lan is taller than nga , but linh is taller than lan Linh is ...... of the three girls

1 hợp chất của nguyên tố X hóa trị III vs nguyên tố Oxi trong đó X chiếm 53% về khối lượng a,Xác định nguyên tử khối và tên nguyên tố X b, Viết CTHH và tính PTK của hợp chất

helpppppppppppppppppppp hứa sẽ hậu tạ

Cho hình thang cân ABCD (AD ║ BC, AD < BC) Kẻ các đường cao AH, DK của hình thang cân đó `a`, CM `BH = CK` `b`, Kẻ `HM ⊥ AB` tại `M` `KN ⊥ CD` tại `N` CM tứ giác `AMND` là hình thang cân $\text{Mong các chuyên gia giúp!!! T^T}$

Khi mùa thu sang Mặt Trời lặn xuống bờ ao Ngọn khói xanh lên lủng liểng Vườn sau gió chẳng đuổi nhau Lá vẫn bay vùng sân giếng Xóm ngoài nhà ai giã cốm Làn sương lam mộng rung rinh Em nhỏ cưỡi trâu về ngõ Tự mình làm nên bức tranh Viết bài văn miêu tả từ việc đọc hiểu bài thơ trên