10. We will spend two months going on vacation with our family 

=> It

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 ………………………………

16. Lan hasn't written to Maryam for a  month.

Lan last...............

17. The last time we surfed the Internet was 2 days

=>It is

18. We have gone swimming together since last week

=> It is

19. They haven’t taken their children to the zoo before

=> This is