Field trip / by Susan Nees.

Enhanced descriptions from Syndetics:

Missy's fourth book is even more super duper royal deluxe than the last one!This series is part of Scholastic's early chapter book line called Branches, which is aimed at newly independent readers. With easy-to-read text, high-interest content, fast-paced plots, and illustrations on every page, these books will boost reading confidence and stamina. Branches books help readers grow!In this book, Missy's class goes on a field trip to the state capitol. Missy cannot wait to visit what she is sure will be the most awesome gift shop ever! But she soon learns that the capitol does not have a gift shop. Missy decides this simply MUST change! Since the students are all partnered up for the day, Missy cannot go anywhere without Oscar. Missy knows she is supposed to complete the tour along with the rest of her class, but does Missy do anything like everyone else? As with everything, Missy--and her trusty friend Oscar--find a way to make the class field trip super duper royal deluxe!