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2 năm trước
Cho a gam hỗn hợp X gồm Fe và FeS tác dụng với dung dịch HCl dư thu được hỗn hợp khí Y có tỉ khối đối với H2 bằng 9. Cũng a gam Xcho tác dụng hết với 36,75 gam dung dịch H2SO4 80% đun nóng thu được V lít khí SO2 ở đktc và dung dịch Z. Cho dung dịch Z tác dụng với dung dịch BaCl2 dư thu được 34,95 gam kết tủa .Tìm a và V
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I. Use the correct form of the word given in each sentence : 1. The teaching staff of our school are all highly ................................(experience) 2. Portable computers are good for accessing while travelling....................................(inform) 3. He got good marks because he answered the question ............................................(persuade) 4. Three hundred people were made by the earthquake............................................(home) 5. The hurricane brought total to the city yesterday..............................................................(destroy) 6. What should we do to prevent environment ? (disastrous) II. Use the correct form or tense of the verb given in each sentence: 1. Students who.................................... the exam will be given a certificate. (pass) 2. Tim........................................................ by the time I arrived (go) 3. I will never forget.................................. him for the first time.(meet) 4. It................................................................ outside as people arrived for the party. (snow) III. Rewrite each of the following sentences in another way so that it means almost the same as the sentence printed before it 1. Because he had walked three kilometres, he was very tired. He had.............................................................................................. 2. I wonder if she knows the answer. She doesn’t....................................................................................... 3. “ Do you like shopping, Tom?” asked Lucy. Lucy asked.......................................................................................... 4. No other European city is as polluted as Athens. Athens is............................................................................................

1. Choose the correct adjective in each sentence. 0. I studied hard all day. Now i feel....... A. Tired. B. Tiring. 1. She's ...... of her job. She's looking for another. A. Bored. B. Boring 2. This wet weather is so ....... A. Depressed B. Depressing 3. I didn't find his joke very....... A. Amused. B. Amusing 4. I am ..... of snakes A. Frightened b. Frightening 5. I am ...... about my test grades A. Depressed. B. Depressing 6. There's nothing more...... than riding on a roller coaster A. Excited. B. Exciting 7. I was ..... to hear he's 50. He looks much younger. A. Surprised b. Surprising 8. The book i'm reading is........ A. Interested. B. Interesting 9. You look..... what's wrong? A. Worried. B. Worrying 10. We had a....... time at the restaurant. The place is awful. A. Shocker. B. Shocking A.

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