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nhuquynh06
2 năm trước
Nung hỗn hợp gồm hai muối CaCO3 và MgCO3, thu được 76g hỗn hợp hai oxit (CaO, MgO) và 66g khí CO2. Tính khối lượng hỗn hợp hai muối ban đầu.
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I. Choose the word whose underlined part is pronounced differently from the others. 1. A. happy B. hour C. high D. hotel 2. A. so B. coat C. note D. bottom II. Choose the word which has the main stress placed differently from the others. 3. A. garbage B. junkyard C. protect D. treasure 4. A. collect B. publish C. protect D. provide III. Choose the correct answers to complete the sentences. 5. _________ air is one of the many problems we have to solve. A. Pure B. Polluted C. Dust D. Pleasant 6. I’ e in tr u e if I _________my passport. A. lose B. will lose C. lost D. would lose 7. We can eat at home or, ________ you prefer, we can go to a restaurant.  turn off (v): khóa, tắt  turn on (v): bật, vặn A. when B. whether C. if D. which 8. If it is raining this evening, I_________. A. will go out B. d n’t g ut C. go out D. w n’t go out 9. Minh’s Eng ish is ex e ent. He spea s________. A. perfectly English B. English perfectly C. perfect English D. B,C are correct 10. I’ disapp inted _________ pe p e have sp i ed this area. A. that B. when C. if D. how 11. He ________ to find a job but he had no luck. A. hardly tried B. hard tried C. tried hardly D. tried hard 12. We u dn’t g n a pi ni as p anned __________ it was raining. A. however B. but C. because D. so 13. If he ________ hard today, can he have a holiday tomorrow? A. works B. will work C. worked D. would work 14. ________we were tired, we sat down beside the stream. A. Because of B. If C. As D. And 15. S ar energy d esn’t ause __________. A. pollution B. polluted C. pollute D. pollutant 16. Are you looking forward ___________ my letter? A. to see B. to seeing C. saw D. seeing 17. “ ___________” eans a pie e f and fu f ru ish. A. junkyard B. treasure C. hedge D. stream 18. Dynamite _________ many years ago. A. has invented B. invented C. was invented D. were invented 19. Because there _________ no buses, we had to take a taxi. A. are B. is C. was D. were 20. We plan to ________ this Saturday. A. go hiked B. go hiking C. go to hike D. go hike

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