=>
1. C -> follow (should V: nên làm gì)
2. A -> according to: theo
3. C -> ceremonies (one of the most adj + N số nhiều)
4. C -> of eating (custom of Ving)
5. C -> more (so sánh hơn more adj than)
6. D -> respect (giới từ + N)
7. A -> should
8. B -> had to (câu tường thuật)
9. A -> type
10. D -> learn about
11. D -> painting (be good at Ving)
12. A -> went (yesterday evening -> QKĐ)
13. B -> a stranger (a/an + N số ít)
14. C -> at (at + giờ)
15. B -> do you leave (do/does S V?)
