Chất x là chất có tính oxi hóa mạnh tương tự như nước giaven được dùng để tẩy trắng vải sợi giấy .so với nước giaven chất x rẻ hơn hàm lượng hipoclorit cao hơn nên còn dùng để tẩy uế hố rác công rãnh chuồng trại chăn nuôi .x là chất gì ?viết công thức phân tử của x trong phòng thí nghiệm có được điều chế như thế nào ?viết phương trình minh họa

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I. Supply the correct verb forms. 1. The Earth (circle)__________________ the sun once every 365 days. 2. The farmers (work)___________________ in the filed at the moment. 3. We (live)______________________________ in France for 20 years. 4. Mai (lose)__________________________ her dictionary. She can’t find it anywhere. 5. I (be)_______________________ sorry. I (forget)_______________________ that girl’s name already. 6. You (ever/see)________________________________ a lion? 7. What (you/do)______________________________ yesterday? 8. I think it (rain)_________________________ tomorrow. 9. It isn’t a very good party. Most people (already/ gone)______________________ home. 10. “ Do you have any plans for this afternoon?” ~ “Yes, I (look)_____________________________ round the museum.” II.Fill in each blank an appropriate preposition. 1. Alexander Graham Bell was born ___________ March 3rd , 1845 _____________ Scotland. 2. He worked ______________ deaf-mutes________________ Boston University. 3. I’ll come _________________ to pick her _____________________ at 8 o’clock. 4. I couldn’t meet Mrs Chi because she’s _______________. 5. He worked very hard and finally came __________ __________ a very important invention. III. Give the correct forms of the words in brackets. 1. There wasn’t any ____________________ in our village two years ago. (electric) 2. Our life is much better with the help of modern _____________________ (equip). 3. “The Lost Shoes” is one of the ___________________ stories I like best. (tradition) 4. ___________________, the step mother was very cruel to Little Pea. (fortunate) 5. Everyone was ___________________ at the soccer match. (excite) VIII. Each sentence has four underlined words or phrases. The four underlined parts of the sentence are marked A, B, C, and D. Circle the letter of the one underlined word or phrase that is NOT CORRECT. 1. Look at those dark clouds! It will rain. A B C D 2. I hope I am going to pass the exam. A B C D 3. Where did they went yesterday? A B C D 4. Why you call me so late last night? A B C D 5. An umbrella is in my bag. Take it. An umbrella is not new. A B C D