Houghton Mifflin Soar to Success: Camp Knock Knock Lv 4 CAMP KNOCK KNOCK (Read Soar to Success 1999)

At summer camp, Willie is king of the knock-knock jokes. That is, until he is challenged by Crow, who claims to be the best at everything. So the campers decide to have a contest, and soon the jokes are flying fast and furious. Who will be the new knock-knock king?