Choose the best answer to fill in the blank. 6. You can save money while shopping by only buying ________ you need. A. this B. what C. it D. that 7. If we ________ all the trees, there will be no more oxygen for us to breathe. A. cut down B. cut off C. cuts D. cutting 8. Our dream house will use only solar energy so that we can make the ________ clean and green. A. home B. nature C. kitchen D. Entertainment 9. A hi-tech robot will help us ________ children while we are away. A. look in B. look at C. look out D. look after 10. We should have recycling binsin each classroom for ________ things. A. reused B. use C. reuse D. reusable

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Bạn nèo nhanh mình cho 5* vài ctlhn nha

Bài dưới viết ngược lên bài trên nha. :3

Một hợp chất X gồm 2 nguyên tử Z liên kết với 5 nguyên tử O và có phân tử khối nặng hơn khí nitơ là 3,86 lần a) Xác định phân tử khối của hợp chất trên b)Xác định nguyên tử của Z,tên nguyên tố và hoá trị của X

I. VOCABULARY Choose the word or phrase that best completes each sentence below. 1. My brother is one of the most famous stamp ______ in Hanoi. A. collection B. collectors C. collector D. collectors 2. _____ is the hobby I spend most of my time on. A. Photograph B. Photographing C. Photographer D. Photography 3. Like most of her friends, Lan often plays _____ games in her free time. A. board B. boarding C. boarder D. aboard 4. Swimming is fun because you can play in the water and keep _____ at the same. A. fit B. fitted C. fitting D. fitly 5. Children should eat _____ food like orange or vegetables instead of fast food. A. unhealthy B. healthy C. health D. healthily 6. My mother always takes good _____ of me. A. care B. look C. eye D. mind 7. My father is a ____, so he has to read a lot of newspaper for ideals. A. writing B. write C. writer D. written 8. The girl fell asleep as soon as she got _____ the bus. A. on B. off C. out D. up 9. His painting are very _____ and expensive, he’s a true artist. A. beauty B. beautiful C. beauty D. beautifully 10. If you don’t hurry up, you will be late _____ school. A. for B. at C. in D. to

II. GRAMMAR Choose the word or phrase that best complete each sentence below. 11. Richard: “Do you enjoy doing the school quiz?” Gabriel: “_____” A. Of course, I will. B. What’s the matter? C. That’s the least I could do. D. It was lots of fun. 12. Tyler: “Let’s buy this pink purse for Mum!” Selena: “_____” A. Yes, you’re right. B. Good idea! C. I’m fine, thanks. D. You must be a fool! 13. My sister is keen _____ sports. She plays a lot of tennis and badminton in her free time. A. on B. of C. about D. at 14. Quang is good _____ Math, he can solve any problem very quickly. A. at B. to C. about D. on 15. We can make flower vases or lamps _____ old glass bottles. A. of B. up C. from D. in 16. I find _____ a useful sport for my health. A. swim B. swimming C. swimmer D. swam 17. _____ do you find dancing as a hobby? A. What B. Who C. Why D. How 18. When my father retired, he took _____ golf as a hobby to stay healthy. A. on B. at C. up D. in 19. Hoa loves reading comics, but she says she _____ this hobby in the future. A. will continue B. won’t continue C. continues D. doesn’t continue 20. I think in the future more people _____ gardening. A. will enjoy B. enjoy C. enjoyed D. enjoying

Choose the best answer to fill in the blank. 6. You can save money while shopping by only buying ________ you need.A. this B. what C. it D. that7. If we ________ all the trees, there will be no more oxygen for us to breathe.A. cut down B. cut off C. cuts D. cutting8. Our dream house will use only solar energy so that we can make the ________ clean and green.A. home B. nature C. kitchen D. environment9. A hi-tech robot will help us ________ children while we are away.A. look in B. look at C. look out D. look after10. We should have recycling binsin each classroom for ________ things.A. reused B. use C. reuse D. reusable11. With a smart watch, you will ________ your friends in other countries.A. speak B. say C. talk D. contact12. ________ pencils and paper, every studentwill have a computer.A. Instead of B. By C. at D. Instead13. “Do you think we should put a ________ bin in every classroom in order to keep it clean?”.A. recyclable B. recycling C. recycled D. reusable14. “Why do you often forgetto ________ the lights when you go out of the classroom?”A. close B. turn off C. turn on D. shut down15. We might have a ________ TV to watch TV programmes from space.A. automatic B. wireless C. local D. remote16. I any letter from him yet.A. haven’t received B. received C. will receiveD. don’t receive

IV. READING Read the passage and then decide whether the sentence are True (T) or False (F). Tom Barry – international skateboarder! Tom Barry is 17 and started skateboarding when he was nine. He grew up in New York where he practiced hard and won his first competition when he was fourteen. He was lucky. A writer SKATE IT! magazine watched him that day, then wrote an article about him. “They even made a video of me!” Tom said. “I left school last year and now the magazine is playing me to practice and to skateboard in international competitions. But I am not doing this for money. I’m doing this because it’s so much fun”. Tom has just returned from Japan. Skateboarding is the third most popular sport for boys aged 12-16 in the USA but in Japan it is less well-known. 26. Tom began skateboarding before his tenth birthday. A. True B. False 27. A magazine journalist saw Tom on the day he won his first competition. A. True B. False 28. Tom is lucky because he often wins international competitions. A. True B. False 29. Earning lots of money is important to Tom. A. True B. False 30. Skateboarding is becoming more popular in Japan than in the United States. A. True B. False

Chứng minh rằng giá trị các biểu thức sau không phụ thuộc vào giá tri của biến x: x(x^2+x+1) –x^2(x+1)-x+5