Câu 3 (2,5đ): Hòa tan hoàn toàn 56g sắt bằng dung dịch axit clohiđric( HCl ), phản ứng kết thúc thu được muối sắt clorua ( FeCl2) và khí hiđro. a. Lập phương trình hóa học. b. Tính khối lượng axit clohiđric(HCl) đã tham gia phản ứng. c. Tính thể tích khí hiđro sinh ra ( ở đktc)

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Chuyển từ chủ động sang bị động mình cần gấp giúp mik với EXERCISE 5. Present perfect tense 1. I have already watched the play before. ____________________________________________________________ 2. The 1999 flood has destroyed our city. ____________________________________________________________ 3. He has used his pencil instead. ____________________________________________________________ 4. This is the first time I have seen such a lovely dog. ____________________________________________________________ 5. The student hasn't done the homework yet. ____________________________________________________________ 6. They have taken her to the hospital. ____________________________________________________________ 7. They have cancelled the meeting. ____________________________________________________________ 8. Someone has moved my chair. ____________________________________________________________ 9. Someone has given him a lot of money. ____________________________________________________________ 10. We have invited all the students in the school. ____________________________________________________________ 11. We have told him not to be late again. ____________________________________________________________ 12. Our teachers have explained the English grammar. Thầ y Bùi Văn Vinh – 0988.333.599 110 ____________________________________________________________ 13. Have you finished the above sentences? ____________________________________________________________ 14. The police have arrested the mugger. ____________________________________________________________ 15. The police have arrested five suspects ____________________________________________________________ EXERCISE 6. Past perfect tense 1. They had finished doing their homework before they went to the cafeteria. ____________________________________________________________ 2. Her husband had done the housework before 7 party yesterday. ____________________________________________________________ 3. Before going shopping yesterday, David had cleaned the kitchen. ____________________________________________________________ 4. Wonbin had played the video game for four hours. ____________________________________________________________ 5. Ms Nina hadn't seen the film before. ____________________________________________________________