Cho 5g hỗn hợp hai muối CaCO3 và CaSO4 tác dụng vừa đủ với 200ml dung dịch HCl, sinh ra 448ml khí ( đktc ) a) Viết PTHH b) Tính nồng độ mol của dung dịch HCl đã dùng c) Tính thành phần trăm khối lượng mỗi muối trong hỗn hợp trên ( Giải hộ e với ạ 😄 )

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9. Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (19). In the United States and Canada, it is very important to (17) ______a person directly in the eyes when you are having a conversation with him or her. If you lookdown or to the side when the (18) ______ person is talking, that person will think that you are not interested in what he or she is saying. This, of course, is not polite. If you look down or to the side when you are talking, it might (19) ______that you are not honest. However, people who are speakingwill sometimes look away for (20) ______ seconds when they are thinking or trying to find the right word. But they always turn immediately back to look the listener directly in the eyes. These social "rules" are (21) ______ for two men, two women, a man and a woman, or an adult and a child. A: seem B: come C: turn D: become 10. choose the correct sentence A, B, C or D. A: City children play less freely on the streets because of crowded traffic. B: City children play freelier on the streets because of crowded traffic. C: City children play freely on the street because of crowded traffic. D: City children play more freely on the streets because of crowded traffic. 12 choose the correct sentence A, B, C or D. A: The starry sky at night in the countryside is clearer and fantastic than that in cities. B: The starry sky at night in the countryside is more clear and fantastic than that in cities. C: The starry sky at night in the countryside is more clearer and more fantastic than that in cities. D: The starry sky at night in the countryside is clearer and more fantastic than that in cities. 13 Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. Question 15. There are a number of drawbacks of living in the city. A: advantages B: benefits C: disadvantages D: difficulties Help me~