Audio CD
In the CD audio book form, the texts are read vividly by American professional voice actors.(MP3 files downloaded for free)
After-reading Test
Solve an additionally provided After-reading Test for each book.
The Korean translation, Answer Keys, a Word Quiz, a Word List, and Aha! Tips for each book
You can download them for free at www.ihappyhouse.co.kr or www.darakwon.co.kr