1.You need to attend the course. → It’ 2.She is responsible for looking after the puppy. → Taking the puppy 3. The test was hard, so we couldn’t do it successfully. →We couldn’t do it successfully beacause the test 4. We are disappointed that people have spoiled the lake. →It is 5. Why don’t we use energy saving appliances instead of ordinary ones to save energy? → I suggest that 6. The students are preparing for the coming lecture. That pleases our form teacher. →Our form teacher is 7. We shouldn’t use plastic bags so as to have a clean environment →Our environment will be 8. The children are excited about going to the circus. → The children are looking 9. When did you start learning English? →How long is ? 10. Mary works hard as a student. → Mary is 11. He bought this car because of its low price. → He bought 12. It rains heavily, so we can’t go out. → Because of 13. She was lazy, so she couldn’t pass the exam. → Because of her 14. Nobody can do the test because of its difficulty. →Because the test 15. He couldn’t go to school because of his sickness. → Because

vẽ saitama................................đi mà

Hỗn hợp X gồm H2, C2H4 và C3H6 có tỉ khối đối với H2 là 9,25. Cho 22,4 lít X (đktc) vào bình kín có chứa một ít bột Ni. Đun nóng bình một thời gian, thu được hỗn hợp khí Y có tỉ khối so với H2 bằng 10. Tính số mol H2 đã phản ứng.

Dẫn hỗn hợp A gồm một anken và H2 (có tỉ lệ số mol 1 : 1) qua Ni nung nóng thu được hỗn hợp B. Tỉ khối của B so với A là 1,6. Tìm hiệu suất phản ứng hiđro hóa.

Làm hộ mình câu 4 và câu 3 nhé cảm ơn nhiều

Bài 16: Cho hỗn hợp X gồm etilen và H2 có tỉ khối so với H2 bằng 4,25. Dẫn X qua bột Ni nung nóng, sau một thời gian thu được hỗn hợp Y. Biết hiệu suất phản ứng hiđro hóa là 75%, tìm tỉ khối của Y so với H2.

Vẽ sơ đồ lập luận cho văn bản nước đại việt ta

CÂU HỎI ĐUÔI – TAG QUESTIONS Choose the best option to complete these following sentences. 1. We don't need to go to the store today, _______? A. don't we B. do I C. do we D. need we 2. Susan can bring some food, _______? A. won't she B. will she C. can't she D. can she 3. The party starts at eight o'clock, _______? A. isn't it B. doesn't it C. does it D. is it 4. The movie was very long, _______? A. isn't it B. wasn't it C. was it D. is it 5. There's a dictionary on the shelf, _______? A. isn't it B. isn't there C. aren't there D. is there 6. There's a lot of noise outside, _______? A. aren't there B. are there C. is there D. isn’t there 7. Mrs. Smith is sick, _______? A. is she B. is she C. wasn't she D. isn’t she 8. The dishes are dirty, _______? A. weren't they B. isn't they C. aren't they D. are they 9. Steven won't be at the party, _______? A. won't he B. isn't he C. will he D. is he 10. The math test was very difficult, _______? A. wasn't it B. isn't it C. weren't they D. was it 11. We can go tomorrow, _______? A. won't we B. can we C. can't we D. will we 12. I'm early, _______? A. isn't I B. aren't I C. are I D. am I 13. This shirt is too big for me, _______? A. isn't it B. doesn't it C. does it D. is it 14. Emily plays the piano well, _______? A. isn't it B. does she C. doesn't she D. is she 15. Your neighbours went on vacation, _______? A. isn't they B. did they C. aren't they D. didn’t they

viết một đoạn văn ngắn theo cách quy nạp ( độ dài tối đa 1/2 trang giấy thi ) trình bày suy nghĩ về trách nhiệm của thế hệ trẻ đối với việc giữ gìn bản sắc văn hóa dân tộc trong thời kỳ hội nhập

giải phương trình: -1/2 x^2 = kx-k-2 mình cần gấp giải giúp mình với ạ