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emilia03022002
1 năm trước
từ 800 tấn quặng pirit chứa 10% tạp chất trơ có thể sản xuất bao nhiêu mét khối dung dịch H2SO4 98% ( d= 1,86g/ml) . Giả sử tỉ lệ hao hụt 15% trong toàn quá trình
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I. Give the most suitable form of the words given. 1. Many people know that smoking is_________, but they do the smoking every day. HARM 2. We have to travel to work by bike to reduce air_________. POLLUTE 3. He is known as a very quick man. He disappears and_________ without being seen. APPEAR 4. Old people like living in the countryside because it is very_________ and quiet there. PEACE 5. _________ is one of the main causes of crimes and diseases. POOR 6. In the South of Vietnam, many people are living in a condition of water _________. SHORT 7. Many children in Africa countries are suffering from the worst_________. NUTRITION 8. We often hear about_________ in school here and there in our schools. VIOLENT II. Complete the following sentences with tag questions. 1. Mrs. Mary is a teacher at your school, _____? 2. He went to school late yesterday morning, _____? 3. Over crowded places have a lot of problems, _____? 4. You live in the countryside, _____? 5. He cannot speak French, _____? 6. Peter is not doing his school work now, _____? 7. They have finished their work so far, _____? 8. He won't take part in the competition, _____?

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