Choose the correct options

1. Can you explain [why|who|what] you are doing this?
2. The town [when|where|that ] I live is far from the capital.
3. Who is that man [which|whom|whose ]
   hair is grey?
4. The runner [which|who|whom ]
   won the race is from the USA.
5. The day [when|which|that] the accident happened was foggy and rainy.
6. What's the problem [who|where|that]
   bothers you so much?
7. I haven't read the report [which |whom|whose]
   you've given me yet.
8. Is there anybody [which|who|whose]
   you trust?