In high school I had a math teacher, Mrs. Davies, who took her job seriously and expected her students to put forth the same degree of commitment (付出). Strict but fair, she held our attention with her great method. One of her ______ was for students who were more advanced academically. I chose to ______ it and soon realized that the course was a bit over my head. I ____ with the complex problems that others seemed to learn without much effort.One Friday we were tested ______ our ability to use a theorem (定理) that no one in the class thoroughly understood. The teacher would ______ our p