A substitute teacher plus a simple mix-up equal adventure! "Miss Huff looked over her class and sighed deeply. Sarah was sticking her tongue out at Emily. Billy was making faces at Carl. Nancy blew such a big bubble that she floated across the room and got stuck in Francine's hair." Miss Huff loves teaching, but she could sure use a day off. When she accidentally mixes up her plans for the substitute teacher with her day-off activity list-well-things...