Bài 7: Một bếp ăn dự trữ gạo đủ cho 120 người ăn trong 50 ngày. Nhưng sau đó,có một số người đến thêm nên số gạo chỉ đủ ăn trong 30 ngày. Tính số người đến thêm?

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Rewrite the following sentences, beginning with the given words. 1. This is the third time we have walked along the beach together. We have ............................................. 2. I haven’t met that man here before. It’s the ............................................................................................ 3. This is the second time I have played truant. I have ............................................................................... 4. This is the first time he has been rude to her. He has ............................................................................. 5. They have never had an argument before. This is .................................................................................. 6. I started doing my homework 2 hours ago. I have .................................................................................. 7. We began painting the walls yesterday. We ............................................................................................ 8. It started snowing half an hour ago. It .................................................................................................... 9. They began to build that bridge in July. They ......................................................................................... 10. Our current manager started working here 10 years ago. Our current manager has ............................. 11. I have studied English for 3 years. I began ............................................................................................. 12. It’s a long time since he heard from his brother. He hasn’t .................................................................... 13. It’s 3 years since I last wrote to her. I haven’t ........................................................................................ 14. They last invited me 5 years ago. They haven’t ...................................................................................... 15. The last time I saw him was in 1995. I haven’t ...................................................................................... 16. I haven’t heard from Sarah for a couple of months. The last …............................................................. 17. I last saw him 3 years ago. I haven’t …................................................................................................... 18. She’s the most beautiful girl I’ve ever seen. I have .…........................................................................... 19. It’s the fastest car he’s ever driven. He has .…....................................................................................... 20. It’s the most expensive watch I’ve ever bought. I have …...................................................................... Write complete sentences with the given words. 1. If/ she/ work hard/ she/ have/ enough money / make ends meet. 2. He/ usually/ get embarrassed/ if he/ make a mistake/ when speaking English. 3. It/ not matter/ if/ some of you/ come/ late. 4. When/ Mary/ listen to classical music/ she/ always/ feel happy. 5. My dog/ sit down/ when/ I/ say 'sit'. 6. If/ son/ study hard/ he/ usually/ get/ good grades/ school. 7. Ben/ often/ play loud music/ if/ he/ be/ at home alone. 8. If/ you/ sit/ in the sun for too long/ you/ get burned. 9. If/ it/ war film/ may/ quite violent. 10. If/ you/ write down/ pin number/ someone/ may/ use/ it. Rewrite the following sentences, beginning with the given words. 1. I have made plans to go to the museum of modern Art with Mary on Saturday. I am ……………….. 2. If I don’t practise the piano every evening, I forget how to play it. Unless ............................................ 3. Unless people eat, they get hungry. If .................................................................................................... 4. If I don’t get home on time, my dad shouts at me. Unless ...................................................................... 5. Unless I feel very well, I stay in bed. If I ............................................................................................. 6. We have made plans to visit Paris next month. We are ......................................................................... 7. It’s possible that it’s true. It could ..................................................................................................... 8. It’s possible that he’ll want to borrow my notebook. He may .............................................................. 9. It’s possible that we won’t go out on Sunday. We might ........................................................................ 10. It’s possible that we won’t win the match. We may ............................................................................