Here are the completed questions with the correct question words:

1. **Whose** books are these? They're Lisa's.
2. **Who** is that boy? He's my teacher.
3. **What** is your name? Mary.
4. **What** is it? It's a watch.
5. **Where** do they live? In London.
6. **Whose** is this skateboard? It's mine.
7. **Who** are those girls? They're Kate's friends.
8. **When** do you finish work? At 2 o'clock.
9. **Who** lives in this house? My grandma.
10. **Whose** toys are those? They are my brother's.