Sequential Spelling 4 by Don McCabe Cat.
Students quickly begin to learn all the troublesome blends and structural endings.
Each lesson has cross references to The Patterns of English Spelling and to Word Families in Sentence Context . Homophones are presented when they occur. The homophones tract and tracked are presented in the teacher's book for optional presentation. The word tract is an 11th grade word in our school's regular spelling text. Regular spelling texts, as a general rule, pick grade levels for words according to when the specific words first begin to occur in the regular subject matter curriculum.