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2 năm trước
Hấp thụ hoàn toàn 8,96 lít CO2 (đktc) vào 500 ml dung dịch gồm NaOH 0,5M và KOH 0,6M thu được dung dịch X. Khối lượng chất tan trong dung dịch X là * 41,7 gam. 41,85 gam. 34,5 gam. 41,45 gam.
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I. USE OF ENGLISH: 1. Choose A, B, C, or D which best completes the sentences: 1. We should use energy – saving bulbs to save………………………… A. energy B. garbages C. water D. power 2. I think we ………….. turn off the TV after 10 o’clock in the evening. A. may B. should C. can D. shall 3. Tom suggested _________ to eat. A. go out B. going out C. to going out D. went out 4. I think we should _________ energy in order to save money. A. waste B. turn C. use D. save 5. Our environment is extremely _________ . A. wasted B. ended C. polluted D. covered 6. My Dad is alway go to the library. He loves_________________. A. read B. to read C.reads D. reading 7. If you are busy, we____________this by ourselves.. A. would do B. did C. will do D. doing 8. If we go on _________ the water, there will be a shortage of fresh water in the near future. A. pollute B. pollution C. polluting D. polluted 9. In a few years’ time, our houses will be heated by _________ energy. A. nuclear B. solar C. coal D. natural 10. We will be late for school _________ the bus is late. A. because B. so C. however D. but 11. The teacher divided the students _________ four groups. A. in B. into C. on D. onto 12. The cost of living in Vietnam is low compared _________ Singapore. A. as B.with C. of D. than 13. He forgot his umbrella_________ he got wet . A. so B.becauseof C. since D. but 14. My students can speak English very _________ . A. fluently B. fluent C. fluence D. fluenting 15. The fact is that a _________ faucet can waste 500 litre of water a month . A. drip B. dripping C. drips D. dripped 2. Supply the correct Tense or Form of the Verbs in parentheses: 1. We shouldn’t ____________ the garbages( litter) 2. We are looking forward to___________ from her. (hear) 3. Her grandpa used to ________________ his living by catching fish. (make) 4. We ______________ an ideal place to live if we keep our neighborhood clean, (have) 5. In the future solar energy _____________ to replace fossil energy. ( use)

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