The Giant Jellybean Jar (Penguin Young Readers, Level 3)

Ben loves jelly beans, and every week he goes to Jo-Jo's Jelly Bean Shop hoping to guess the riddle that will win him a whole jar full of them.  He always knows the answer to the riddle, but he has never won the prize.  It's hard to speak out loud in front of so many people, but with a little help from his sister, Ben finally learns to say what he's thinking.