Ozon không tác dụng với chất nào sau đây: A. H2 B. Cu C. Ag D. Au

Tìm điều kiện của x,y để biểu thức A lớn hơn 1: A= ($\frac{x}{y^{2}+xy}$ - $\frac{x-y}{x^{2}+xy}$ ) : ($\frac{y^{2}}{x^{3}-xy^{2}}$ + $\frac{1}{x+y}$ ) : $\frac{x}{y}$ Tìm giá trị của x để biểu thức B lớn hơn 1 B= $\frac{x}{x-2}$ - $\frac{2}{x-3}$

0,2 x 317 x 7 + 0,14 x 3520 + 33,1 x 14

cho hình chóp SABCD có đáy ABCD là hình vuông tâm O, SA vuông góc với đáy, SA=AB=a. gọi M,N lần lượt là trung điểm BC và SD. Chứng minh AD vuông góc mp (OMN)

Mn ơi giúp mình với ah. Giúp mình Từ câu 36 đến câu 50 với ạ. Mình cảm ơn. Mình ình trọn cho ctlhn ạ

* Choose the best anwer 1. What awful restaurant! a. an b. a c. one d. the 2. We ……….. English at the moment. a. are learn b. learn c. learning d. are learning 3. This dress is the expensive of the four dresses. a. best b. more c. most d. the most 4. is it from here to school? a. How long b. How high c. How far d. How 5. What about …………… games? a. play b. playing c. to play d. to playing 6. He writes articles for a newspaper. He is a . a. journalist b. teacher c. doctor d. musician 7. Minh____________ television every night. a. watchs b. watches c. watching d. to watch 8. I’d like …………… some stamps for over seas mail. a. buy b. to buy c. to buying d. buying 9. She ____________ thirteen years old next week. a. will b. be c. is d. will be 10. Her new school is ____________than her old school. a. very big b. big c. bigger d. biggest 11. My mother always drives . a. careful b. carefuly c. carefully d. slow 12. You ought to the dentist’s. a. to go b. go c. going d. went 13. How is your brother ? _ He’s 1.70 meters. a. high b. tall c. weight d. heavy 14. She her teeth three times a day. a. brush b. brushs c. brushes d. brushed 15. Stop, please. That is too coffee. a. many b. lots of c. little d. much 16. A balanced diet is good your health. a. to b. with c. in d. for 17. It took us an hour to Nha Trang. a. to drive b. drive c. driving d. drove 18__________ visiting Ha Long Bay? –That’s a good idea! a. How about b. Let’s c. What about d. A&C are correct 19. Students have two __________each day. a. 20-minutes breaks b. 20-minute breaks c. 20-minute break d. 20-minutes break 20. __________do you go to bed? - At nine. a. What b. When c. What time d. Where 21. Hanoi is the capital city, but it is __________than HCM City. a. the smaller b. smaller c. smallest d. small 22. Which is the eighth month of the year? a. September b. February c. November d. August 23. -Where ____________________ from ? –England. a. is she b. does she come c. will she be d. A & B are correct 24. In the future, robots and machines __________all the work for us. a. are doing b. will do c. does d. do 25. Look! Here is Nam. He __________the guitar in the room. a. play b. plays c. is playing d. will play 26. She __________some of her friends to her birthday party next week. a. invites b. inviting c. will invite d. going to invite 27. I have English class __________seven o’clock __________Monday. a. at / on b. on / on c. in / at D. at / at 28. __________a lovely living room! a. How b. What c. It d. When 29. Let’s __________to school. a. going b. to go c. go d. goes 30. Mr. Jones has __________summer vacation every year. a. a three-week b. a three weeks c. a three- weeks d. a week- three 31. It take me ten minutes to go to school every day. A B C D 32. I’ll go and seeing mom and dad on their farm. A B C D

V. For each situation, write a sentence with WISH or IF ONLY. 1 Ann isn'n here. I need see her now. 2 I'd like to take some photographs but i didn't bring my camera. 3. Jonh would like to be a pilot when he grows up . 4. It's cold and i hate cold weather. 5. I'm sorry I didn't come to the party last night. 6. I can't go to the party and I'd like to. 7. I regret that you didn't give me a chane to tell you the truth. 8. I regret I didn't apply for that job. 9. Marry is afraid she won't be able to attend your wedding next week. 10. My life isn't interesting . 11. I regret I didn't learn to play a musical instrument. 12. I live in a big city, but i don't like it. 13. You drive too fast . I'd like you to drive more slowly. 14. He is sorry now that he didn't invite Molly to his party. 15. It is raining . I want to go out , but not in the rain. AE GIÚP MK VS Ạ MK DÂNG CẦN GẤP

Giúp mik với mọi người. Em cần gấp, thx

xả điểm lè: vẽ anime chibi nha có chữ ký của mình, của các cậu và ko ký nha (chung 1 pic) KO VẼ NHIỀU PIC NHA VÌ MÌNH MUỐN NHANH

các bn tính từ ngày 29/4 đến 7/7 là bao nhiêu ngày z