Đốt cháy 3,2g kim loại A (hóa trị II) trong không khí thu được 4g một hợp chất oxit duy nhất. Tìm công thức phân tử của oxit đó?

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I. Put the verbs into the correct forms 1. Our environment ____________ by people’s bad behavior. (destroy) 2. Gold ____________ in California in the nineteenth century . (discover) II. Change these sentences into the passive voice Part A: Simple present tense 1. She puts her pens and pencils in the second drawer. ...................................................................................................................................................... 2. I study the reports very carefully. ...................................................................................................................................................... 3. She writes many letters everyday. ...................................................................................................................................................... 4. Kim gives the reports to Mr. Wilson everyday. ...................................................................................................................................................... Part B: Simple past tense 5. We heard the sound of music ...................................................................................................................................................... 6. The police arrested ten men. ...................................................................................................................................................... 7. She didn’t send that letter yesterday. ...................................................................................................................................................... 8. Columbus discovered America in 1492. ......................................................................................................................................................