Need Book Recs

So, I'm a student teacher. I've been working with a preschool class (4-5 y/o) since the beginning of the year. My time in their classroom is up in about a month and I don't want to just up and disappear on the kids. Does anyone have any suggestions on a book I can read to them? (Preferably not one about the last day of school as I don't want to confuse them) Thank You in Advance !