1. Quite surprisingly, what inspired him to accept the challenge?
2. He turned around and smiled to everybody.
3. These young people are always dreaming to participate in the football match.
4. She has made many friends and fully enjoyed life fun in college.
5. After the professor finished her speech, everybody stood up and showed her respect.
追问麻烦把第一句改成陈述句?
追答What inspired him to accept the challenge is quite puzzling.