Cho 6 gam bột Mg tác dụng với 70 gam dung dịch HCl 36,5%. a) Tính thể tích khí (đkc)thu được sau phản ứng. b) Tính nồng độ phần trăm của các chất trong dung dịch thu được.

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Choose the correct answer 1. She _________ the ocean before she moved to Vancouver. A. had never seen B. never seen C. have never seen D. had never saw 2. The teacher ________ out when I arrived in the classroom. A. goes B. have gone C. has gone D. had gone 3. I ______ my document before the power went out in the computer lab. A. had save B. have saved C. had saved D. saved 4. When they arrived we _________ the test. A. had already started B. have already started C. starts D. already starting 5. George _________ his furniture before he moved to Japan. A. have sold B. had sold C. had sell D. sells 6. David uses English as his mother ……….. because he comes from the UK. A. tongue B. mouth C. nose D. cheek 7. The government of New Zealand has done a lot to ……….. the culture of the Maori. A. preserve B. surround C. puzzle D. pronounce 8. Before you asked, the letter………. A- was written B-had been written C-had written D-has been written 9. Almost everyone……for home by the time we arrived. A-leave B-left C-leaves D-had left 10. By the age of 25, he …….two famous novels. A- wrote B-writes C-has written D-had written 11. While her husband was in the army, Janet ……. to him twice a week. A-was writing B-wrote C-was written D-had written 12. I couldn’t cut the grass because the machine…….. a few days previously. A-broke down B-has been broken     C-had broken down D-breaks down 13. When I was young, I ………to be a singer. A-want B-was wanting C-wanted D-had wanted