1. v
2. does -> is
3. far -> long
4. v
5. Why -> What
6. many -> much (How much do/ does + S + cost)
7. has -> have
8. v
9. Whom -> Who (My little brother ⇒ chỉ người: who)
10. v
11. v (Whose chỉ sở hữu)
12. v
13. v (How far is it from ... to ...)
14. How -> What
15. who -> whom