Chia động từ trong ngoặc

Nội dung t18. Mary (be) ____________________ seriously ill last night. 19. Your brother often (go) ____________________ school by bus? 20. I (not study) ____________________ English when I was 8. 21. We (not see) _____________ them next Sunday. 22. Look! The bus (come) ……………..in nhắn quá dài