Hãy xác định công thức của hợp chất khí A và gọi tên, biết rằng: _ A là oxit của lưu huỳnh chứa 50% oxi. _ Khí A nặng hơn khí metan 4 lần.

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Ex 3: From the given adjectives of column 1 in ex 2, fill in each gap with a suitable word: 1. She always get good marks because she is_______________. 2. He is very____________. He can reach the ceiling. 3. How____________does it take to get to the hospital? – About 3 minutes. 4. Vietnamese ‘s hair is often____________. 5. There is nothing in this box. It is totally______________. 6. This room is not_____________. We need to sweep it. 7. You should eat more. You are too____________. 8. It ‘s a sunny day. The sky is____________. 9. This exercise is___________. You should do it by yourself. 10. Hanoi is the capital of Vietnam. It ‘s___________and noisy. Ex 4: Choose the correct answer to fill in the blank 1. - A: Would you like to drink a cup of tea ________ coffee? - B: Coffee, please. A. and B. or C. although D. but 2. My brother plays volleyball well ________ I do not. A. and B. but C. or D. although 3. Most people like watching comedy ________ it'ssxery entertaining. A. because B. so C. although D. but 4. _________ Minh likes sport programmes, he watches this animal programme with his family. A. Because B. Although C. and D. but 5. The film is very interesting. It's both moving ________ funny. A. and B. or C. although D. but 6. I have to go out, ________ I cannot watch television with my family tonight. A. but B. so C. although D. or 7. We decide to go out ________ it's raining heavily. A. though B. so C. because D. but 8. ________ she knows that watching too much TV is a bad habit, she watches less TV than she did before. A. Because B. Although C. or D. but Ex 5: Fill in each blank with one of the conjunctions "and/ or/ but/ so/ because/ although" to complete the sentences. 1. Is her child a boy ……………a girl? 2. I forgot to bring the map, ……………….I got lost. 3. He failed the examination …………………..he didn't study hard. 4. Lien won the match ………………………. she was injured. 5. My new classmate is quite friendly …………………… sociable. 6. I don't like watching films on TV …………………….. I like watching them at the cinema. 7. She likes watching cartoons ………………………….they are colorful and funny. 8. He helps his friends a lot …………………. he is very busy. 9. Lan sings very well …………………..she cannot sing in front of many people. 10. The movie was very boring ……………….. we went out to go shoppin