Если "не полные" ответы нужны то вот:
1) How old is Denis?
- He's eleven years old.
2) Where does he life?
- With parents and brother Alex.
3) How old is his brother?
- Six years old.
4) What's his favorite sport?
- Volleyball.
5) What does he do on Saturday?
- Play volleyball.
6) What's his favorite subject?
- Geography.