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Hỗn hợp khí gồm CO, CO2, C2H4 và C2H2. Trình bày phương pháp dùng để tách từng khí ra khỏi hỗn hợp
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Change these sentences into reported speech 1. Daisy said : “ Please lend me your history book, Joana. ” ……………………………………………………………………………………………… 2. The police said : “ Don’t touch anything in this room, everybody. ” ……………………………………………………………………………………………… 3. Mrs. Green said to her friend : “ Can you help my son with his literature ? ” ……………………………………………………………………………………………… 4. “ You shouldn’t translate each sentence into Vietnamese ”, his brother said. ……………………………………………………………………………………………… 5. “You should learn words and do exercises in order to get good grades”, my teacher said. ……………………………………………………………………………………………… 6. “ You have to take part in the rice-cooking contest tomorrow”, Nam’s father said. ………………………………………………………………………………………………… 7. “It was raining all day yesterday in Nha Trang”, my pen pal said. ………………………………………………………………………………………………… 8. “We are waiting for the school bus now”, the children said. ………………………………………………………………………………………………… 9. “Don’t touch this button or you will get a shock, Ha”, his father said. ……………………………………………………………………………………………… 10. “I must go to Hanoi today”, my friend said. …………………………………………………………………………………………………… 11. “The sun rises in the east and sets in the west”, my teacher said. …………………………………………………………………………………………………… 12. My friend said ,“ I have already written this letter”. ……………………………………………………………………………………………… 13. Carol said to me, “I will ask Mr. Wilson about this lesson the next day”. ……………………………………………………………………………………………… 14. Her friend said to her, “I don’t understand these lessons carefully”. ……………………………………………………………………………………………… 15. Mr. Quang said ,“I must leave right now”. ……………………………………………………………………………………………… 16. Charles said to Jane, “I have to leave the office before 3.30 pm” ……………………………………………………………………………………………… 17. Mary and John said, “We don’t know those two girls very well” ……………………………………………………………………………………………… 18. Jimmy said to Maryam, “I have given you this bike twice” ……………………………………………………………………………………………… 19. Mr. Pike said to me, “ I need you to help me with this work tonight.” ……………………………………………………………………………………………… 20. Helen asked the child, “Are you going to visit your uncle tomorrow ?” ………………………………………………………………………………………………

C. Yes – No Questions. 1. She asked him, “Have you read this book?” ……………………………… 2. “Did you know them, Tom?” she asked. ………………………………… 3. “Are there any letter for me?” Mary said to me. …………………… 4. I asked, “Do you want tea or coffee, Tom?” ……………………………… 5. “Do you know which cup you used?” she asked her son .………………… “ D.WH – Questions. 1. The policeman said, “What is the matter?”……………………… 2. My sister said, “Why are you so said?”…………… 3. She said to me, “Where have you put my shoes?”……………………… 4. He said to her, “Where are you going?”…………………………. 5. He said to me, “When will you come again?”……………………………

A . commands and requests . 1. “Bring me a book”, he said to me. ………………………………………… 2. He said to me, “Don’t come back before one o’clock”. …………… 3. “Have a cup of tea”, he said to her. ………………………………………… 4. Mother said to me, “Don’t forget to lock the door”. …………… 5. “Open the window”, Mother said to him. …………………………… 6. She said to me, “Don’t put your shoes on the chair” .…………………… 7. “Come to the cinema with me”, he said to her. ………………… 8. My grandmother said to me, “Don’t spend all your money on food”. ……… 9. “Shut the door after you”, father said to us. ……………………………… 10. Her father said to her, “Don’t drive too fast”. …………………………… B. Statements. 1. Mary said, “I like oranges better than bananas”. …………………………… 2. He said, “ We have finished our work”. …………………… 3. The secretary said, “I will answer the phone”. ………… 4. The boy said, “I can’t do it”. ……………………… 5. She said, “I’m going away tomorrow”. ………………………… 6. Jack Lumber said, “Olyga Ivanov won the gold medal yesterday”. ………… 7. Father said, “I’m coming back next week”. ……………… 8. He said, “We are having champagne now”. ………………………………… 9. She said to me, “You have got my umbrella” .……………………… 10. I said to her, “I have something to show you”. ……………………

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