1. Although the questions were very difficult, he solved them easily.
- However, despite the questions being very difficult, he solved them easily.

2. Although he was a great actor, he never played a leading role in a film.
- However, he was a great actor, yet he never played a leading role in a film.

3. Although they spent a lot of money on the film, it wasn't a big success.
- However, despite spending a lot of money on the film, it wasn't a big success.

4. Although the film was a comedy, I didn't find it funny at all.
- However, even though the film was a comedy, I didn't find it funny at all.

5. Although we played well, we couldn't win the match.
- However, even though we played well, we couldn't win the match.