Here is the completed text with suitable words filled in:

1. What **does** your father do? - He is a doctor.
2. What **nationality** are you? - I am Japanese.
3. **Why** would you want to be a pilot?
4. What **is he like**? - He's friendly and helpful.
5. What do you **enjoy** doing? - I like reading books.
6. What **does** your brother usually do in **his free time**?

Feel free to ask if you need more help!