31.2g hỗn hợp Al và Al2O3 tác dụng với dung dịch NaOH dư thu được 16.8 lít H2 (0độ C, 0.8 atm) biết đã dùng dư 10ml thì thể tích dung dịch naoh 4M đã lấy ban đầu là ?

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Exercise 1. Turn these sentences into passive voice. 1. People invented the wheel thousands of years ago. → The wheel........................................................................................................ 2. My father waters these flowers every morning. → These flowers.................................................................................................. 3. People use computers all over the world. → Computers....................................................................................................... 4. Are they building a statue of Chu Van An? → Is....................................................................................................................? 5. John invited Fiona to his birthday party last night. → Fiona............................................................................................................... 6. They keep many ancient things in museums. → Many ancient things........................................................................................ 7. Do four busy streets surround the Temple of Literature? → Is....................................................................................................................? 8. People make many famous films in Hollywood. → Many famous films......................................................................................... 9. Her mother is preparing the dinner in the kitchen. → The dinner....................................................................................................... 10.I do all my homework on my computer. → All my homework...........................................................................................