Trouble in the Barkers' Class — Tomie DePaola

Moffie and Morgie are excited. A new girl is joining their class. But Carole Ann is a bully, pushing Moffie and grabbing Morgie's dinosaur book, and that's only the beginning. Then Morgie goes looking for dinosaur eggs on a Saturday morning and finds Carole Ann crying. He discovers why she is so unhappy, and at school, Morgie introduces his new friend. Carole Ann tells everyone how sorry she is for being so nasty. Now everyone has a friend, and school is fun again!