15. Who does teach ...
16. How did you use to go to school?
17. How many people there were?
18. When has she lived here?
19. Why was she absent from at school?
20. Who is the oldest person in your school?
Chúc bạn học tốt. Xin 5 sao và CTLHN.
Câu 15 mình ko đọc đc phần cuối nhưng bạn chép hết vô nha.