Thêm từ gợi ý vào câu sao cho ý nghĩa không đổi

11. Our flight lasts two hours

=> It

12. My father likes booking ticket in travel urgent ( keen)

=> My father 

13. Jimmy thinks riding a horse is interesting  ( fond)

=> Jimmy

     14. We have learnt English for four years.

We started.....................................

15. He learnt English when he was 18

He has ………………………………