Hỗn hợp X gồm N2 và H2 có tỉ khối so với hiđro bằng 3,6. Đun nóng 11,2 lít (đkc) X với chất xúc tác thích hợp, sau một thời gian thu được hỗn hợp Y. Hiệu suất phản ứng trên là 20%. Tỉ khối của hỗn hợp khí thu được sau phản ứng so với khí He (M=4) là

II. Change the following negative sentences into passive voice 1. I don’t know her telephone number. 2. They can’t make tea with cold water. 3. You mustn’t use this machine after 5:30 p.m. 4. I won’t hang these old pictures in the living room. 5. The German didn’t build this factory during the Second World War. 6. She didn’t make the moon cakes last week. 7. He doesn’t meet them in her school everyday. 8. Anna won’t write a letter. 9. The workers haven’t decorated their building yet. 10. The police hasn’t arrested a burglar. 11. Two people arent cooking dinner on the beach. 12. Tina isn’t doing grammar exercises. 13. At this time last year, they weren’t building this house. 14. I wasn’t chatting with my friends while my teacher was teaching the lesson yesterday. 15. After the children hadn’t finished their homework, they went to bed. 16. When she hadn’t done her work she went to the cinema. 17. I am not going to watch films with my friend because I am sick. 18. My sister isn;t going to cook a delicious meal for dinner.

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I. Choose the word which has a different stress pattern from the others. 1. A. coffee B. Chinese C. payee: người nhận D. trainee: Thực tập sinh 2. A. referee: trọng tài B. guarantee C. Japanese D.jubilee 3. A. refugee B. committee C. absentee D. Taiwanese 4. A.Viennese B. Chinese C. Burmese D. Maltese 5. A. engineer B. volunteer C. mountaineer D. reindeer II. Do the quiz and choose the correct answers. 6. Another name for Wales is . A. Saxon B. Celtic C.Cymric D. Galle 7. You can see on the Canadian national flag. A. the maple leaf B. the red leaf C. the rose D. the oak tree 8. In 1893, became the first country in the world to give all women the right to vote. A. Canada B. New Zealand C. America D.Singapore 9. has a unique culture with traditions such as bagpipes, kilts and highland dancing. A. England B. Wales C. Scotland D. Northern Ireland 10. The name "Australia" comes from the Latin word "australis”, meaning . A. northern B. southern C. eastern D. western 11. The tallest mountain the US is Mt McKinley, located in the state of . It reaches 20,320feet (6,194 m) above the sea level. A. Alaska B. California C. Florida D. Washington 12. The Lord of the Rings movies were filmed in . A. England B. Australia C. Canada. D. New Zealand 13. Scotland only shares a border with . A. Wales B. Northern Ireland C. England D. Britain 14. The name Canada comes from the word 'kanata' which means "settlement" or “ ” in the language of the St Lawrence Iroquoians. A. country B. village C. town D. nation 15. The world's largest reef system, the Great Barrier Reef, is found off the north-eastern coast of . A. Canada B. America C. New Zealand D. Australia. Giúp mình với ạ. Mình đang cần gấp lắm ạ. Hãy giúp mình. Mình cảm ơn lắm ạ!!

14. It’s raining. I wish ………………………………….. 15. I am too fat. I wish ……………………………………. 16. The weather is bad today. I wish …………………………………………….