When Jeremy was five he wanted to be an astronaut or a cowboy--or both. And he had a best friend named Mark. But now he's six and wants to be a major-league baseball player or a deep-sea diver. Jeremy knows things change as you grow up, but some things just might stay the same--like your best friend. "Teachers looking for stories on friends to read to kindergarten and first-grade classes will request this picture book year after year."--"Booklist"