Nosotros nos interesan la literatura espanola.
Hmmm.. That looks right to me. Sometimes, teachers will use calmada instead of tranquila. You can ask if that is the case here. Otherwise its possible that the teacher made a mistake. If you are still confused, I would just as whoever your teacher is. I'm sure its a mistake on their part :)
Good luck!!
Me gustan las naranjas. It is las narajnas because gustan matches the plural noun oranges.
