Martha speaks, Teacher's pet

This chapter book based on PBS's popular TV show Martha Speaks features two back-to-school stories, plus a glossary and activities. In the first story, T. D. adds Martha's name to the substitute teacher list at Wagstaff Elementary, but not even he expects a talking dog to actually fill in for Mrs. Clusky. Never one to ignore the call of duty, Martha takes the class under her wing-er, paw-but Helen's not sure their friendship can survive Martha's...