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I/
1. Jane has worked as a television presenter for five years.
2. Impressive as the building was, it wasn't to my taste.
3. Unless you work hard, your parents won't be happy.
4. Anyone who understands this books is cleverer than I am.
5. No sooner had they left than the bomb exploded.

II/
1. Despite being beautiful and intelligent, she didn't win the Miss World competition.
2. If he hadn't disobeyed, the manager wouldn't have been angry.
3. The higher the unemployment rate is, the higher the crime rate is.
4. The students regrets not having prepared for the lesson.
5. The child had difficulty in opening the window.