tính bằng cách thuận tiện nhất: 0,8x60+0,4x22x2+1,6x18x0,5

Complete the second sentence so that it means the same as the first. 3. I switched my mobile phone off. Then my mum tried to ring. -> I had switched…………………………………………………………………………………………................. 4. First John corrected his mistakes. Then he gave his essay to the teacher. -> John had ………..................................................................................................................... 5. There are hardly any chocolate bars in the box! -> There are very ....................................................................................................................

Bán kính hình tròn B gấp 3 lần bán kính hình tròn A. Nếu hình A lăn xung quanh hình B, nó phải thực hiện bao nhiêu vòng quay để trở lại điểm xuất phát?

" I have something to show you " He Said to her Giải júp mik ạ Thank mn trc

trong đoạn văn từ dòng sông năm căn mênh mông đến hai dãy trương thành vô tận có sd biện pháp tu từ hãy cho biết tác giả sd biện pháp tu từ này mấy lần liệt kê từng lần nêu tác dụng của phép tu từ đó trong việc thể hiện nội dung đoạn trích

Cho hình chóp s.abc có sa, sb, sc đôi một vuông góc và sa=a,sb=sc=a căn 2. gọi m là trung điểm của ab. tính góc giữa các đường thẳng a)(AC,SB) b)(AC,SM)

Exercise 8 1. They________ tomorrow at 12:30 a. will leave b. are leaving c. are going to leave d. leave 2. Someone________ at the door, can you answer it? a. knocks b. is knocking c. has knocked d. knocked 3. John________ at the moment, so he can't answer the telephone. a. works b. is working c. has worked d. will work 4. The river________ after last night's rain. a. flowed b. flows c. is flowing d. will flow 5. He________ for Chelsea this season. a. played b. is playing c. would play d. has played 6. We shall make a trip around the world when the opportunity________ itself to us. a. will present b. will have presented c. presents d. will be presenting 7. This pupil________ his best and ________ only one mistake in his dictation. a. made/did b. did/made c. made/made d. did/did 8. The holiday makers________ in the sunshine to get sunburnt. a. laid b. lied c. led d. laying 9. The snake________ one big egg last week. a. lay b. laid c. led d. laying 10. I'm afraid you________ number. a. have mistaken b. are with the wrong c. have the wrong d. made the wrong 11. I like looking at the pictures, but I ________ enough by lunch time. a. should have b. will have c. will have had d. have 12. I don't understand this sentence. What________? a. does mean this word b. have this word mean c. means this word d. does this word mean 13. John________ tennis once or twice a week. a. usually play b. in usually playing c. usually plays d. have usually played 14. It was noisy next door. Our neighbors________ a party a. had b. were having c. had had d. have had 15. It________ dark. Shall I turn on the light? a. is getting b. get c. got d. has got 16. I________ for Christine. Do you know where she is? a. look b. looked c. am looking d. looks 17. At 5 o'clock yesterday evening, I ________ my clothes. a. am ironing b. have ironed c. ironed d. was ironing 18. Are you ready, Ann? Yes, I________ a. am coming b. come c. came d. have came 19. Why________ at me like that? What's the matter? a. do you look b. have you looked c. did you look d. are you looking 20. I________ along the street when I suddenly heard footsteps behind me. a. was walking b. a walking c. walk d. walked Exercise 9 1. There was a time when watching TV really________ family entertainment a. were b. was c. had been d. is 2. Last year they __________ 22 million TV sets. a. were selling b. has sold c. has sold d. sold 3. At last the bus came. We _________ for half an hour a. waited b. was waiting c. have waited d. had been waiting 4. Through the rain, I ______ a lighted window and a sign wich said "Sam's Place".

viết 1 đoạn văn từ( 15- 20 câu) phân tích nguyên nhân , động lực nào khiến mọi người tích cực phòng chống dịch bệnh corona.

(x-1)^3-x(x+1)^2=5x(2-x)-11(x+2)

Nhận xét nào sau đây là đúng? A: H2 là chất khí nhẹ nhất trong tất cả các chất khí. B: Phản ứng của H2 với O2 gây nổ mạnh nếu tỉ lệ thể tích là 1:1. C: Trong các phản ứng H2 thể hiện tính oxi hóa. D: H2 không phản ứng với CuO khi đun nóng.