11. all of the children of the smith are really keen on playing rackets

→ keen on dùng để diễn tả sở thích

12. i detest motor rancing most, and i will never do it in my life

→ detest + V_ing

13. the harvest festival in my hometown usually start in october, but this year it started earlier, in the middle of september

→ so sánh hơn với tính từ ngắn

14. it takes a buffalo about half of a day to plough that field, but a machine can do it faster with an hour

→ so sánh hơn với tính từ ngắn

15. in cities, classrooms are better equipped than in the countryside with speakers, computer, projectors

→ so sánh hơn