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cho m gam tinh bột lên men thành ancol etylic với hiệu suất 80%, hấp thụ hoàn toàn khí co2 sinh ra vào nước vôi trong dư thu được 30g kết tủa. tính m
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Giúp em với ạ : Exercise 4: Choose the correct answers. 1. I ……………….. I ……………….. the door bell. A. slept/ didn’t hear B. was sleeping/ weren’t hearing C. was sleeping/ didn’t hear D. slept/ weren’t hearing 2. I ……………….. her many times but she ……………….. A. was phoning/ weren’t answering B. was phoning/ didn’t answer C. phone/ weren’t answering D. phoned/ didn’t answer 3. ‘What ……………….. during your day-off?’ ‘I ……………….. TV.’ A. were you doing/ watched B. did you do/ was watching C. were you doing/ was watching D. did you do/ watched 4. He ……………….. money from the rich and ……………….. it to the poor. A. steal/ gave B. stole/ gave C. stolen/ given D. stealing/ giving 5. ‘……………….. James yesterday?’. ‘Yes, I ……………….. him.’ A. Did you meet/ met B. Did you met/ meeting C. Was you meeting/ didn’t met D. You were meeting/ met 6. The children ……………….. when their mother ……………….. home. A. were sleeping/ got B. was sleeping/ got C. slept/ was getting D. slept/ got 7. I ……………….. dinner when the lights ……………….. out. A. was having/ went B. has/ go C. having/ went D. had/ went 8. It ……………….. me quite much time to learn French. A. taking B. take C. to take D. took 9. As I ……………….. down the street, I ……………….. a strange sight. A. was walking/ saw B. walked/ saw C. were walking/ seeing D. were walking/ saw 10. I ……………….. a car last month. A. buying B. buys C. bought D. have bought

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