I use this vocabulary unit with students that have already demonstrated a clear understanding of common pre-fixes. This teaches the concept of absorbed or assimilated prefixes and contains more advanced vocabulary. It also provides two homework assignments, a multiple choice quiz, and answer key. I typicaly spread the unit across two weeks to allow adequate time for homework completion and test preparation. This group was named "Cha Chas" to distinguish their materials from the intermediate and beginner groups within my general education reading class. Definitions are also included.