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(x-1/2y).(x+1/2y) (xy^2+1).(1-xy^2)
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Exercise 2. Checking tense of verb 16. She brought a lot of money with her so that she could bought some duty-free goods. 17. Have you ever read any novels writing by Jack London? 18. It is suggested that smoking should to be banned in pubs, restaurants, and other public places 19. On Saturdays, I enjoy to go to the concert with my friends. 20. Before to go out, remember to turn off the lights. 21. I'd rather to stay at home than go out at weekends. 22. That old building is going to be pull down by the workers. 23. They stopped to work because of hot weather. 24. We were advised not drinking the water in the bottle. 25. Isabel expected admit to the university, but she wasn’t. 26. Mary was determined to leave the office by 4:30 for catching the early train home. 27. Yuri Gagarin was the first man flying into space. 28. She was among the few who wanted to quit smoke instead of cutting down. 29. I used to getting up late when I was small. 30. Did Carol agree to go camp with you? 31. Eaten too many sweets may cause stomachache. 32. The result of that test must be inform before August. 33. It is believed that in the near future robots will be used to doing things such as cooking. 34. It is saying that the price of gold is going up. 35. She wanted to know how long it would take us getting there. 15. He told us about the hotel that he had stayed the previous summer

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