Papa Period Versus Mega Rock

In PAPA PERIOD VERUS MEGA ROCK, Papa Period must stop Mega Rock from rolling into Hillsword Elementary School. The problem is, he hasn't been able to stop anything lately, including sentences. Will Papa Period be able to meet the challenge? Follow the whimsical characters of Hillsword in each installment of the Momma Comma and Friends series as they introduce young learners to the importance of punctuation. (Appeals to K - 3rd graders. Lexile 540)