Knock Knock! Who Is that?

This is one of the books in the series for kindergarten to year 2 kids to read, also suitable for beginners. The book is focused on word "e;who"e;, which is related to my last book "e; a shopping day"e;. Easy and interesting to read with repetitive practice on the key word.The series are decodable books with each of them focusing on one letter or letter combination.