A comprehensive 4-page expansion for Lesson 18 of a reading intervention program. It focuses on the morphology base 'struct' and the academic vocabulary word 'obstruct', along with explicit instruction in short vs. long I vowel sounds. It includes foundational morphology work, a reading passage ('The Blocked Path') with fluency tasks, comprehension questions with discussion frames, and structured writing practice with punctuation and transition support. Designed for high school TESOL students.