In a Level 1 entry in the ``Bank Street Ready-to-Read'' series, a little black girl asks each member of her large suburban family where her favorite ballplaying companion, Lulu, could be. Once the tour of home and family (plus a useful number of repetitions of basic words) is complete, Lulu turns up. The satisfying surprise: she's a dog. Alley's illustrations are as brisk and user-friendly as the text of this warm family story. (Easy reader. 4-8)