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Hòa tan một lượng kim loại kiềm vào nước thu được dung dịch Y giải phóng 0,45 gam khí. Pha dung dịch Y thành V lít dung dịch Z có pH=13. V có giá trị là: A.1,5 lít B. 3,0 lít C. 4,5 lít D.6,0 lít
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Bài 1: 1. ………………….. he didn’t understand everything, he was interested in the conversation. A. However B. Even though C. Because D. While 2. I’m going to travel around the world …………………..I turn 60. A. for B. since C. before D. while 3. ………………….. their children go to university, they will sell their house and travel around the world. A. After B. When C. Once D. All are correct 4. I’m going to do some gardening ………………….. it gets dark. A. because B. but C. until D. so 5. I can’t tell you the decision ………………….. I know it myself. A. as soon as B. while C. when D. until 6. The food wasn’t very good, ………………….. he ate everything. A.so B. but C. because D. although 7. I like my new job ………………….. better than my old one. A. more B. most C. much D. very 8. My new colleagues are ………………….. than I expected. A. more nice B. most nice C. nicer D. nicest 9. My old boss was the ………………….. friendly person I’ve ever met. A. least B. less and less C. less D. so 10. ……………I leave home, ………………….. the journey is because the buses aren’t so crowded. A. The more early - more easy B. The earlier - the more easy C. The earlier - the easier D. The more early - the easier Bài 2: 1. We …………… more time with our children before they left for university. We were too busy with our jobs to think about that. A. wish we spent B. were supposed to be spending C. wish we had spent D. regret that we didn’t spend 2. …………… more points to discuss, the meeting has now come to an end. A. On account of B. Regardless of C. Not having D. There being no 3. She has…………… good a computer that she has used it for 6 years without any errors. A. so B. such C. how D. too 4. Price continued to rise while wages remained low ……………the government became increasingly unpopular. A. provided that B. in order that C. on condition that D. with the result that 5. If coastal erosion continues to take place at the present rate, in another fifteen years this beach …………… anymore. A. doesn’t exist B. isn’t existing C. isn't going to exist D. won’t be exist 6. If I tell you a secret, ………………you promise not to tell anyone else? A. would B. did C. will D. have 7. In those days of the last economic crisis if you ……………… a job, you……………… lucky. A. got - were B. had got-would be C. get-will be D. got-would be 8. ………………, let me know. A. If you heard anything B. Had you heard anything C. Unless you heard anything D. Should you hear anything 9. He would certainly have attended the party ……………… A. had the tire not flattened itself B. if he didn’t get a flat tire C. if the flat tire hadn’t happened D. had he not had a flat tire 10. I wish that you ……………… come to the party tonight. Can you ask your parents one more time? A. can B. are able to C. could D. would -Nhanh nha-

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