$III.$
17. True
18. True
19. True
20. False
21, They sometimes go swimming in the swimming pools.
22. Yes, they do.
$IV.$
23. What a beautiful bathrooom!
24. How many subjects we study at school?
25. Would you like to see a movie?
26. I will visit my parents on their farm.
$V.$
27. What about going to the zoo?
28. Lan's father has fewer vacations than Tom's father.
