Each sentence has one mistake. Underline and correct it

IV.
Each sentence has one mistake. Underline and correct it
17. We are interesting in watching football matches in our free time.
18. We visit a milk farm this weekend. Would you like to join us?
19. Go pass that bus stop and you can see my school.
20. What do they like? - They are kind and clever.
21. West Lake is the wide lake in Hanoi.