Many students enter high school unskilled in the art of reading to learn from science textbooks. Even students who can read full-length novels often find science books difficult to read because students have relatively little practice with the various types of expository text structures used by such textbooks. In this article, the authors present an activity using a modified form of the sentence completion or "fill-in-the-blanks" worksheet that reinforces students' fluency with expository text structure and context.