Find a mistake in each sentence below

IV. Find a mistake in each sentence below
21.      My teacher finds teach hard but he loves working with children
A       B                        C                       D
22.      He enjoy fishing because it is interesting. 
 A        B                      C         D
23.      When I have free time, I will go swimming.
A       B                 C            D
24.      If you have a lot of coins, stamps, toys, bottles or dolls, your hobby is painting     
A                B                C               D
25.      There are many reasons why it is importance to have a hobby 
A                 B                           C               D