1,B → should + Vinf
2, A → According to sth/Vinf
3, A → the traditional of + danh từ
4, C → of eating: custom of doing sth: phong tục làm gì
5, C → more important than là so sánh hơn
6, D → respect : a sign of + danh từ
7, A → should: should never là phủ định rồi không cần shouldn’t
8, D→ had to: chia quá khứ