Giả sử có 3 nhóm người sản xuất có thời gian lao động cá biệt khác nhau trong khi đó trên thị trường XH chỉ thừa nhận mua bán với thời gian lao động xã hội cần thiết Nhóm sản xuất Thời gian lao động cá biệt A 2 B 4 C 6 Xác định thời gian lao động xã hội cần thiết cuả 3 người sản xuất là bao nhiêu? Nhận xét 3 người sản xuất trên? - Quy luật giá trị có yêu cầu gì đối với người sx và người lưu thông hàng hóa?

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EXERCISES: PAST TENSES I. Put in the correct verb form of the past tense. 1. Yesterday, I (go)___went___ to the restaurant with a client. 2. they (buy)___bought____ a new car two days ago 3. I (not go) ___didn’t go___ to school last Sunday. 4. Did She (get) __get____ married last year? 5. I (be) __was____ a student 2 years ago. 6. We (stay) _____were staying____at home at 7 pm last Monday. 7. While I ____was studying___ (study) in my room, my roommates ____were having_____ (have) a party in the other room. 8. Mary and I _____were dancing____ (dance) in the house when the telephone rang. 9. She (do)________ this exercise yesterday at 8 o’clock 10. I (watch)________ TV at 8 o’clock last night. 11. When we arrived, the train (leave) _______ the station 12. I called you at 8:00am, but you (go) ______ out 13. Before I went to bed, I(take)_______ a bath and (brush) ______my teeth 14. She (win) _____ the gold medal by 1986 15. By the end of the 20th century, scientists (discover)______ the cure for common cold. 16. It (snow)__________ for three days when suddenly the sun came out. 17. Sam (work) _________here for six years before he left to go to university. 18. Margaret was born in 1950. By the year 2005, she (live) __________on this earth for 55 years . 19. We (walk) _____along the road for about 20 minutes when a car stopped and the driver gave us a lift. 20. When I arrived, Ann (wait) _______for me. She was rather annoyed with me because she (wait) ________for a very long time. II. Put in the correct verb form of the past tense. 1. When I saw Ben last week, he said he ________ (stop) smoking, but when I saw him 2 days later, he _______ (smoke) a cigarette. 2. Lucy went to the living room. It was empty but the television still warm. Someone _______ (watch) it. 3. I _______ (play) tennis so I had a shower. I was annoyed because I _______ (not win) a single game. 4. Liz_______ (go) to the Bahamas for her holidays last year. 5. We _______ (watch) a film on TV when our guests arrived. 6. They _______ (already/see) the film twice at the cinema when she rented it on video. 7. I _______ (walk) down the street when it began to rain. 8. My mother ________ (cook) dinner for 3 hours by the time our guests arrived at my house. 9. I ________ (play) tennis so I had a shower. I was annoyed because I ________ (not win) a single game. 10. I ________ (already/eat) breakfast by the time the others woke up. 11. At this time last year, I _______ (attend) an English course. 12. Jim ________ (stand) under the tree when he heard an explosion. 13. The teacher _______ (teach) the children a song yesterday. 14. My friend Harry _________ (fall) off the ladder while he _______ (paint) the ceiling of his room. 15. He _______ (sit) on the train at this time yesterday morning. 16. By the time he left the office, he _______ (attend) three meetings. 17. At this time yesterday I _______to music. (listen) 18. Yesterday, I (get) ______ up at 6 and (have) ______ breakfast at 6.30. 19. I ______ (lose) my keys when I ________ (walk) home. 20. It was raining while we ________ (have) dinner. 21. We (drive) ______ around the parking lot for 20 mins to find a parking space. 22. That boy ( have ) ______ some eggs last night. 23. She (spend) ________ all her money last week. 24. They (go) _____________ home after they (finish) _____________ their work 25. The children (play) _____________ football when their mother (come) ________ back 26. She said that she (already, see) _____________ Dr. Rice 27. When we (come) _____________ to the stadium, the match (already, begin) _____________ 28. Before she (watch) _____________ TV, she (do) _____________ her homework 29. After taking a bath, he (go) _____________ to bed 30. She (win) _____________ the gold medal in 1986 giải giupdnkinhf với mình cho ctlhn nha