Before pronouns were a common thing to list after your name, they were the subject of a Schoolhouse Rock song. If you ever watched Schoolhouse Rock, this will bring back memories. If you never watched Schoolhouse Rock, this will probably still be solvable, but you won't have a song about pronouns stuck in your head when you finish.
I'm not familiar with Schoolhouse Rock - I'm listening to the song now, so the Kangaroo clue for IT makes sense to me now, and also the reference to WHO brought the rhinoceros on the bus? lol the song is pretty damn catchy... fun puzzle thanks