Do Bananas Chew Gum?

Sam acts like a smart aleck to keep from looking dumb. Sam Mott's made it most of the way through sixth grade barely able to read and write. Now Sam's family's moved again, and none of the kids in his new school have started calling him Dumbhead Sam -- yet. But how long can Sam keep his problem secret when even the second grader he baby-sits for reads better than he does?