gọi tên, phân loại các chất sau: Ba(OH)2, Fe(OH)3, SO3, K2O, CuO, P2O5, BaCl2, Na2CO3, K2SO4, KCL, KOH,H2SO4, H2S

Exercise 2: Choose the correct answers. 1. He didn't need______ out of his room in Moscow. a. go b. to going c. going d. to go 2. I could not ______ it even though I had wanted to do so. a. had bought b. buy c. buying d. have bought 3. I left my pen in this box, but it isn’t there now. Someone______ it. a. must have taken b. must take c. had to take d. had taken 4. Mary received 100 dollars from her sister. She______ the ring she wanted. It only costs 10 dollars. a. buys b. had bought c. bought d. might have bought 5. It lost my Honda last week; I hadn't locked it. You______ it. a. should lock b. should have locked c. ought to lock d. could lock 6. In 1900 the world had no deaths from rabies. Scientists______ wonderful vaccine. a. has discovered b. discovered c. must have discovered d. should have discovered 7. Mary received 100 dollars from her sister. She______ the computer she wanted. It costs 200 dollars. a. wouldn't buy b. hadn't bought c. couldn't have bought d. didn't buy 8. Once Helen failed in her exam. She played too much. She______ too much. a. shouldn't have played b. should play c. shouldn't play d. wouldn't have played 9. If I had liked that watch, may be I ______ bought it. a. will have b. must have c. would have d. shall have 10. Did my sister tell you that I had been to Dalat? a. might have b. could have c. would have d. must have 11. The women of this tribe______ precious ornaments for slat because they didn’t have any salt. a. have traded b. traded c. would have traded d. could trade 12. I took my only son to the park but he didn't like it. You ______ him to the zoo. a. should take b. had to take c. took d. should have taken 13. We are now wet. You______ the raincoats with you. a. should bring b. should have brought c. must bring d. have to bring 14. The yard is wet. It______ last night. a. must rain b. must have rain c. must have rained d. had to rain 15. Many birds will______ more than 3,000 miles to reach their winter homes. a. flying b. fly c. be fly d. flew Exercise 3: Choose the correct answers. 1. The bird sang____ (its/ it/ it’s) happy tune. 2. Listen to____ (her/ hers/ her’s) careíully. 3. ____(His/ He/ She) uncle is a doctor. He is a nice person. 4.That old man is kind to ____ (our/ us/ we). 5. William and Tracy love ____ (their/ theirs/ they) dogs so much. 6. My car is new but ____(her/ hers/ she) is old. 7. The teacher told___ (us/ our/ we) an interesting story. 8. I want to sit between you and ____(he/ him/ his). 9. She has an apple in ____ (she/ her/ hers) hand. 10. Bob and Ted live near ____(them/ their/ they) school. 11. Hoa’s pencil case ___ (is/ are) blue. ___ (Her/ She) fiends’ pencil cases are violet. 12. ___ (Those student’s school bags/ Those students’ school bags) are very heavy. 13. What is______ (your/ you) father’s job? _______ (He/ His) is an engineer. 14. How old______ (are/ is)_____ (your/ you) sister? _______ (She/ Her) is ten years old 15. _______ (The women’s bilces/ The womens’ bikes) are new but_______ (the mens’ bikes/ the men’s bikes) are old.

kíu eym ( đúng 5*+CTLHN, sai báo cáo)

Giải chi tiết giúp em với ạ, em xin cảm ơn mọi người nhiều

a) 1(km/h) =……(m/s); b)72(km/h) = …..(m/s); b) 3.108(m/s)= ….(km/h); c) 15(m/s) = ….(km/h); d) 12( m/s) = ....? (km/h) d) 48 (km/h) = ....?(m/s).

Vẽ cho mk 2 ảnh nhớ Tô màu + digi - line

Cho hình thang ABCD , đáy lớn CD gấp đôi đáy bé AB . M là trung điểm cạnh CD . AC cắt BD ở I . a, Kể tên các tam giác có diện tích bằng nhau . b, So sánh Sabc và Smbc biết Sabc = 17cm2 . Tính Sdbc

Giúp mình bài 6 và 7 này với

1.bạn nên về sớm nếu không......... 2con trai cô ấy thực sự rất giỏi toán trong thực tế.......... 3mọi người rất muốn có cún cao vì......... 4 tom hiếm khi ăn hải sản nhưng.......... 5 không có đường vì thế.............

Lớp 5A có 4 tổ thu nhập giấy vụn biết rằng số giấy vụn của tổ 1 2 3 là 31 kg, số giấy vụn của tổ 2 3 4 là 30,5 kg số giấy vụn của tổ 3 4 1 là 29,75 kg số giấy vụn của tổ 4 1 và 2 là 30,25 kg .Hỏi mỗi tổ thu được bao nhiêu kg giấy vụn