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trumnho
2 năm trước
Bài 6: Trộn từng cặp các dd sau: NH4NO3; Al2(SO4)3; Ba(OH)2; Fe2(SO4)3; H2SO4; Na2SO4; K2CO3. - Viết phương trình phản ứng trong trường hợp có phản ứng xảy ra
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Các câu hỏi liên quan

1. A man was sitting (1) _____ the roof of the house and laughing. 2. Their head office is (2) _____ the eleventh floor of an eighteen-storey building. 3. Is the tallest building (3) _____ the world located (4) _____ Malaysia. 4. We’ll meet (5) _____ the corner of the Le Loi and Phan Chu Trinh street. 5. She parked the car (6) _____ front of the store and ran in. 6. (7) It is ____ a bookshop and a gallery. 7. Where are your grandchildren? They are (8) ____ school and their parents are (9) ___ work. 8. Can you tell me what is (10) ____ the box? – I don’t know. Just open the box to see what it is . 9. I always go (11) ____ school (12) ____ bus. Do you ride (13) __ the bus , too ? 10. Torn to the left. His house is the third one (14) ____ the right. 11. He signed (15) ____ the foot of the letter . 12. (16) _____ the top of the house there’s an attic. 13. The boys had to wait (17) ____ line to get the tickets. 14. Alice sat (18) ___ Harold and James (19) ____ the first row (20) _____ seats. 15. He was brought up (21) ____ a farm, so he is quite used to working (22) ____ the field.

Exercise 6. Fill in have/has been in/to; have/has gone to (positive or negative) 1. I ……… New York several times, but I ……… Atlanta. 2. My boss ……… Lisbon for a week, so I’m doing some of his work for him. 3. We ……… Milan for very long, so we don’t know it very well yet. 4. Martin isn’t here. He ……… the library to get some books. 5. Martha ……… the school to pick up the kids. She should be back by 4.00. 6. I ……… that gallery twice but I haven’t seen the painting you mentioned. Exercise 7. Rewrite the sentences. Use the Past Simple or Present Perfect 1. I started working here three months ago. --> I have……… 2. It has been raining since this morning.  It ……… 3. They have prepared for the meal since 4 o’clock.  They ……… 4. We moved to Stanford in 1995.  We ……… 5. When did they get married?  How ………?

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