Dưới đây là các câu đã được điền “a”, “an” hoặc “the”:

8. I want to travel around **the** world when I grow up.
9. Yesterday my mother had **a** terrible headache.
10. Where are **the** kids? They are playing outside.
11. Peter is **the** most hard-working student I've ever known.
12. It is cold because **the** heating system is broken.
13. Did you buy **a** pair of shoes yesterday?
14. Earth orbits around **the** Sun.
15. She took **a** hamburger and **an** apple, but she didn't eat **the** apple.
16. A boy and a girl are arguing over there, I think I **know the** boy.
17. My grandfather sent me **a** letter and a gift but I haven't received **the** letter.
18. My mom is **the** best mom in **the** world.
19. Would you like **a** glass of water?

Hy vọng điều này giúp ích cho bạn!