先通读下面的短文，掌握其大意，然后根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整。（本大题共5分，每格0.5分）
Karim Kai Ani was once a middle school math teacher. He often f___ a classroom full of bored students. But he couldn’t get angry because he agreed with them—the lessons were really boring! That’s why he became a math coach, a job that a__ him to help other teachers design better lessons.
Then in 2009, he h___ built the math-teaching website Mathalicious, so he could devote his time completely to d__ lessons.
Not like lessons in traditional math t___ books, Mathalicious lessons ask open-ended(开放式的) math questions with real-life applications. For example: Do people with small feet pay m____ for shoes? How long must a person exercise to burn off a Big Mac? Each lesson includes handouts, a teacher’s guide and a short multimedia(多媒体) presentation. Also, each lesson r_ students to use different math skills included in the Common Core State Standards(各州共同核心课程标准).
While the site does offer several f__ samples(样本), you need to pay for the lessons. But for many math teachers, the c__ is worth it. Mathalicious gives them the tools they need to turn bored students into i___ ones.