Answers,
1. I wonder why deadly extreme sports are more popular than ever.
2. I'm asking you, who is the most determind person you know?
3. I'm curious to find out, if this is your first time to go mountain climbing?
4. The reason why I won't try hang gliding is because, I'm afraid of heights.
5. I'm telling you be careful when you go skateboarding.
6. Do you know there are more people trying rock climbing than there are ice climbing?
Hope this helps :-)