49. While she was preparing dinner, she cut her finger.
→ While ____________________________, she cut her finger.
50. Because she had a test coming, she spent the weekend studying.
→ _______________________________ , she spent the weekend studying.
51. While he was drinking his coffee, he thought about the problem.
→ While ____________________________ his coffee, he thought about the problem.
52. As he was impressed by my work, the manager extended my contract.
→ ______________________________ , the manager extended my contract.
53. If it is looked after carefully, the plant can live through the winter.
→ __________________________________ , the plant can live through the winter.
54. They were surprised by a sudden storm, and they had to seek shelter under a tree.
→ ________________________ by a sudden storm, they had to seek shelter under a tree.
55. After she had lived in Oxford for two years, she spoke English like a native speaker.
→ _____________________ in Oxford for two years, she spoke English like a native speaker.
56. After they had bought a house, they asked an architect to redecorate it.
→ After ___________________________________ , they asked an architect to redecorate it.
57. After the thief had been caught by the police, the thief admitted his crime.
→ ____________________________________ , the thief admitted his crime.
58. The agreement was typed by the secretary yesterday. The agreement was signed by the boss.
→ _____________________ by the secretary yesterday, the agreement was signed by the boss.
59. We are lying in the sun and we are enjoying life.
→ _______________________________ , we are enjoying life.

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60. The students know how to do the exercise. The exercise was given by the teacher yesterday.
→ The students know how to do the exercise __________________ by the teacher yesterday.