Answer:
1. Despite of their best efforts, they could not save her.
2. Although it was late, we went for a walk.
3. Despite studying hard, I could not score good marks.
4. Despite my objection, they went ahead with the plan.
5. Although my sister is younger than me, I have great respect for her.
6. Although they hadn’t invited me, I went to their party.
7. Although I invited him he didn't come.
8. Despite being rich and powerful, she leads a miserable life.
9. Although the traffic was bad, I reached my work on time.
