阅读下面短文，从短文后各题所给的四个选项（A、 B、C和D）中，选出可以填入的空白处的最佳选项，并在答题卡上将该选项涂黑。
At college I had a math teacher, Mrs.Smith, who took her job seriously and expected her students to put forth the same degree of commitment．Strict but fair, she held our attention with her time-proven approach．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 papers．I was absolutely     ．Finally, I didn't use the required theorem．Instead, I decided to use more familiar theorems to arrive at an     ．I knew I had failed because I hadn't done the      assignment．I became resigned to my fate．
Our test papers were      back the following Monday．Everyone received a "C" except for me .To my surprise,  I received an "A"． I    that there must be a mistake．I watched    as the teacher approached my desk, smiled, and asked for my test      back．She then went back to copy my work onto the blackboard,      the class how I had arrived at the correct answer．"Mathematics is meant to be a creative tool, pushing our minds to a rewarding answer," she said with confidence．       I didn't use the required theorem, she seemed genuinely proud of how I'd worked through the problem．The class saw her fold my test paper and put it into her textbook．She announced that it would be      with future classes.
My teacher would have been justified in giving me a    grade． Instead, she used the    to deeply influence a student who often struggled．And after forty years, I still cherish the    ．It helped change my self-image．I    up to a broad boundary of possibilities which has made my life an adventure．She understood that teaching went beyond strict demands and could be used to    Thank you, Mrs.Smith．

A．Ways B．tasks C．tests D．classes

A．run B．take C．teach D．like

A．Compared B．struggled C．connected D．argued

A．on B．at C．of D．for

A．explain B．collect C．print D．grade

A．tired B．curious C．lost D．content

A．effect B．end C．answer D．interest

A．Completed B．proved C．fixed D．required

A．handed B．held C．thrown D．dated

A．hoped B．assumed C．declared D．dreamed

A．Angrily B．regretfully C．disappointedly D．nervously

A．paper B．score C．question D．method

A．Helping B．following C．showing D．praising

A．Since B．Unless C．Though D．Because

A．shared B．exchanged C．practiced D．checked

A．Friendly B．failing C．corrected D．wrong

A．possibility B．creation C．intention D．opportunity

A．change B．memory C．school D．life

A．opened B．kept C．made D．looked

A．learn B．survive C．inspire D．Manage