Dan Gutman 
My Weird School #21: Ms. Krup Cracks Me Up! 

With more than 23 million books sold, the My Weird School series really gets kids reading!In the 21st book in the My Weird School series, A.J. thinks that nothing can possibly be as boring as a sleepover in the natural history museum. But anything can happen when Ms. Krup is in charge. The tour guide says that dinosaur skeletons come to life in the middle of the night. Is she right?Perfect for reluctant readers and word lovers alike, Dan Gutman’s hugely popular My Weird School series has something for everyone. Don’t miss the hilarious adventures of A.J. and the gang.