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Tách riêng từng chất ra khỏi hỗn hợp sau: a, Khí H2, Cl2, CO2 b, H2S, CO2, hơi H2O và N2 c, Al2O3, CuO, FeS, K2SO4 d,Hỗn hợp rắn: AlCl3, FeCl3, BaCl2 CÁC BẠN GIÚP MÌNH TRC 9h15 với. Cảm ơn các bạn trc nha
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II.Supply the correct forms of the word in bold. 1. Why was his lecture so______? bore 2. How many______ are there in a year in Vietnam? celebrate 3. ______ have warned the local people of the disaster. science 4. Colin seems______ for this job. No one can do it better him. suit 5. Winning the______ was the great pride of the school. compete 6. This coffee is too______ to drink. heat 7. I can’t tell the______ between the twins. differ 8. A fairy appeared and______ changed Miss Tam’s rags into beautiful clothes. magic 9. He drove______ and he had an accident. care 10. I feel so______ that I’m going to bed. sleep 11. No one has ever know the_______ of his death. TRUE 12. The experiment was_______, so they had to do it again. SUCCEED 13. There was a wave of_______ from Europe to America in the 19th century. MIGRATE 14. Thomas Watson worked as the only_______ to Alexander G. Bell. ASSIST 15. The supporters of the team cheered when the referee blew the_______ whistle. FINALLY 16. Alexander G. Bell was among the greatest_______ of all time. INVENT 17. What is the_______ between the Moon and the Earth? DISTANT 18. I have warned him_______ time, but he won’t listen. COUNT 19. Alexander Bell’s invention was_______ successful. COMMERCE 20. This_______ gives young artists an opportunity to display their work. EXHIBIT

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