I am having an interview for college?

for an undergraduate degree for liberal arts specializing in speech. i no they will ask me why i wanna be a speech therapist and how i think i'll contribute to the program etc etc etc. i wanna be a speech therapist bec i want to help kids grow up confident of who they are and for some kids that means helping them with their speech. plus, its good money for someone of my communital status. anyway, what are some other good reasons i can say at the interview to impress them?!?!?!