hoạt động tại cơ quan bài tiết nào là quan trọng nhất?Vì sao?

1. I’m hungry. Get me something ___________. A. to eat B. eating C. eat D. for eating 2 . I am very delighted __________ the letter from you. 
A. to hear B. to meet C. to see D. to receive 3. Please let me __________ your decision as soon as possible A. know B. to know C. knows D. knowing 4. We watched the little girl __________ across the street.
 A. to walk B. walk C. is walking D. walked 5. He was frightened. He looked as if he ____________ a ghost. A. was seeing B. has seen C. had seen D. saw  

hỗn hợp 2 ankan ở thể khí có phân tử khối hơn kém nhau 28đvc. Đốt cháy hoàn toàn 2,24 lít hỗn hợp trên ta thu được 6,72 lít khí CO2 ( các khi đó ở đktc ) . Xác định công thức phân tử của 2 ankan?

bạn quang vào cửa tiệm dự định mua 3 bánh ngọt và 2 hộp sữa ,số tiền phải trả là 22 nghìn đồng . nhưng quang đã thay đổi ý kiến ,mua 2 bánh ngọt và 2 hộp sữa cô bán hàng trả lại cho quang 1 nghìn 500 đồng . hỏi giá tiền 1 cái bánh , 1 hộp sữa bao nhiêu

T^T mn oi giúp tuii đi mà 1 . Professor Alan insisted that every student ___________ their report by Friday. ​A. finish​​B. finishes​​C. finished​​D. had finished 2. ............... that the company has shown rapid growth in the last two years. ​A. It is reported ​B. They are reported​C. The report was​D. It was reported 3. Viet Nam is interested in saving ......... resources. A. nature B. natural C. naturally D. naturalise 4. Designers are experimenting with a new material ___________ flexibility and lightness. ​A. is combining​​B. has combined​C. that combines​D. combination of 5. ______ broken several world records in swimming. ​A. She is said that she has B. People say she had C. She is said to have D. It is said to have 6. A picture ……………………………..by Van Gogh was discovered in an attic. A. Paint B. painted C. painting D. was painted 7.The fans queued all day__________________to get concert tickets. A. Hoped B. had hoped C. hoping D. to hope 8.Human beings must stop ______the environment. A. to pollute B. polluted C. to polluted D. polluting 9. Tell her __________ for school again. A. not late​​​B. not being late​​C. not to be late​​D. not be late 10. Wine________________________in Australia is sold all over the world. A. Produced B. producing C. produce D. to produce 11.___________is a popular sport in Europe. A. To ski B. Skiing C. Ski D. To skiing 12.There are many ways of _______ ourselves in a big city. A. enjoy B. enjoying C. enjoyment D. to enjoy 13.I never feel like _______ early on Monday morning. A. getting up B. get up C. gets up D. to get up 14. Her story was so ……………………………….that they decided to publish it as a book A. Inspiring B. inspired C. inspire D. to inspire 15._______________________by the best cook in town, the meal was sheer poetry A. Prepare B. to prepare C. preparing D. prepared 16.I had no difficulty ______ to her English. A. listen B. to listen C. to listening D. listening 17. We are ______ buying a new motorbike. A. considering B. deciding C. expecting D. thinking 18.___________________--all day, her head was aching in the evening A. Studying B. having studied C. to study D. studied 19.__________________five miles, he noticed that he had lost his keys on the way. A. Having run B. to run C. running D. run 20.__________________in the fifteenth century, this house is one of the oldest in this area. A. Built B. building C. having built D. have built 21.Peter s father ordered __________ not to stay out late again. A. him B. to him C. that he D. for him 22.I am afraid of _______ by the strong wind. A. taking away B. take away C. being taken away D. being taking away 23. We need to stop _________ at what damage we have done to the nature and try ________it before it s too late. A. looking/ to fix B. to look/ to fix C.to look/ fixing D.looking/ fixing 24.I expected them _______ me a job. A. offer B. offering C.to be offered D.to offer

giải phương trình 1/x-1 + 1/x-2 = 1/x+2 + 1/x+1

Viết một đoạn văn ngắn (không quá 10 dòng) trình bày suy nghĩ của bản thân về điều em tâm đắc nhất được rút ra từ chương trình Dạy học qua truyền hình môn Ngữ văn

Nêu quy tắc cộng hai phân số cùng mẫu và hai phân số không cùng mẫu

Nêu quy tắc so sánh hai phân số cùng mẫu số và so sánh hai phân số không cùng mẫu

một hỗn hợp gồm C2h2 và đồng đẳng A của axetilen có tỉ lệ mol 1:1 hỗn hợp thành 2 phần bằng nhau phần 1 tác dụng vừa đủ với 8,96 lít hidro tạo thành hiđrocacbon no phần 2 tác dụng với 300 ml dung dịch AgNO3 1M/NH3 thu được 40,1 kết tủa tên gọi của A là # ghi rõ xíu ạ.!