Find and correct the mistake

FIND AND CORRECT THE MISTAKE:
a)You haven't to finish this afternoon work; You can leave it later
            A                      B                                            C         D
b)I'll talk to the boss when he will be back.
     A         B        C                      D
c)Everyone was exciting as the prince wanted to choose his wife from the village.
                               A        B                                       C                      D