11. Since Lance was confused, he lost the race in France.

-> ……Being confused, Lance lost the race in France.………………………

12. As grocery coupons had disappeared from circulars, they can now be downloaded from the Internet.

-> ……Having disappeared from circulars, grocery coupons can now be downloaded from the Internet.…………

13. Although mom hunted for bargains in the paper, she wasn’t able to find as many bargains as she finds on the Internet.

-> ………Though hunting for bargains in the paper, mom wasn’t able to find as many bargains as she finds on the Internet.…………

14. Though cheap items are found easily on the Internet, not all the cheap items are easy to get.

-> ………Though are found easily on the Internet, not all the cheap items are easy to get.……………………

15. Althoughshe feltstressful, she decided to keep the job.

->  ……Though feeling stressful (hoặc là Though streetful đều được nha) , she decided to keep the job.………………………

16. Because he gotup late, he was late for work.

à …Getting up late, he was late for work…………………………

17. As I didn't wantto awake him, I turned off the radio.

à ……Not wanting to awake him, I turned off the radio.………………………

18. Before I talked to you, I had never understood that formula.

à ……Before talking to you, I had never understood that formula.………………………

19. Even though the storm damaged the village so badly, it killed nobody.

à ……Though damaging the village so badly, the storm killed nobody………………………

20. After I read the chapter four times, I finally understood the author's theory.

à ……After reading the chapter four times, I  finally understood the author's theory.………………………

21. Because I remembered that everyone makes mistakes, I softened my view of his seemingly inexcusable error.

à ……Remembering that everyone makes mistakes, I softened my view of his seemingly inexcusable error.………………

22. Since he completed his Bachelor's degree, he has had three jobs, each one better than the last.

à ……Since completing his Bachelor's degree, he has had three jobs, each one better than the last.………………………

23. Because the little boy believed that no one loved him, he ran away from home.

à ……Believing that no one loved him, the little boy ran away from home.………………………

24. Before he gained national fame, the union leader had been an electrician in a small town.

à ……Before gaining national fame, the union leader had been an electrician in a small town. ………………………

25. Because we were enjoying the cool evening breeze and listening to the sounds of nature, we lost track of time.

à ………Enjoying the cool evening breeze and listening to the sounds of nature, we lost track of time.……………………

26. Before he became vice-president of marketing and sales, Peter McKay worked as a sales representative.

à ……Before becoming vice-president of marketing and sales, Peter McKay worked as a sales representative.………………………

27. Because I was unprepared for the test, I didn't do well.

à ……Being unprepared for the test, I didn't do well………………………

28. Before I left on my trip, I checked to see what shots I would need.

à ……Before leaving on my trip, I checked to see what shots I would need. ………………………

29. Since Indians in the high Andes Mountains live in thin air, their hearts grow to be a larger than average size.

à ……Since living in thin air, Indians's heart  in the high Andes Mountains grow to be a larger than average size. ………………………

30. Because I hadn't understood the directions, I got lost.

à ……Having not understood the directions, I got lost.………………………

31. My father reluctantly agreed to let me attend the game after he had talked it over with my mother.

à …My father reluctantly agreed to let me attend the game after having talked it over with my mother.………………………

32. When I discovered I had lost my key to the apartment, I called the building superintendent.

à ……When discovering I had lost my key to the apartment, I called the building superintendent.………………

33. Jane's family hasn't received any news from her since she arrived in Australia two weeks ago.

à ……No change………………………

34. Garcia accidentally discovered the Grand Canyon while he was looking for the legendary Lost City of Gold.

à ……Garcia accidentally discovered the Grand Canyon while looking for the legendary Lost City of Gold.………………………

35. Because the forest area is so dry this summer, it is prohibited to light campfires.

à ……Being so dry this summer, the forest area is prohibited to light campfires.………………………

36. After we had to wait for more than half an hour, we were finally seated at the restaurant.

à ……After having to wait for more than half an hour, we were finally seated at the restaurant.………………………

37. Before Maria got accepted on her country's Olympic running team, she had spent most of the two previous years in training.

à ……Before got accepted on her country's Olympic running team, Maria had spent most of the two previous years in training.………………………

38. Though George was paying attention to his driving, he couldn't see the large truck until it was almost too late.

à ……Though paying attention to his driving, Georgecouldn't see the large truck until it was almost too late.………………………

39. Although Nadia was in the hospital with her friends. I called her family to find out what was wrong.

à ……No change………………………

40. We slowly approached the door to the hospital. The nurse stepped out to greet us.

à ……No change………………………

21. Because I remembered that everyone makes mistakes, I softened my view of his seemingly inexcusable error.

à ……Remembered that everyone makes mistakes, I softened my view of his seemingly inexcusable error.………………
* Chị sửa lại cho e câu này nhé, em nghĩ để remembered thích hợp hơn