John Kane 
I say Ooh You say Aah [EPUB ebook] 

'There’s something very important that I need you to remember. When I say Ooh, you say Aah. Let’s try it.’Ooh the donkey has lost his pants. Readers must help him find them! In this picture book, young readers help to sell the story by responding to simple verbal or visual cues. This hilarious book is perfect for reading aloud and is fun for the whole family.