of coffee.It lets what I've just said sink in."

　　When we were called to the next talk，he put down his cup and I __10__ there was not a trace of coffee in it."My doctor __11__ me to stop drinking coffee，"he explained."So I have always used a(n) __12__ cup."I decided to try his __13__ in my class.

　　I took a cup of coffee with me to my next class.It helped.My pauses，as I __14__ the coffee，not only gave my students __15__ to think about what I had said，but gave me time to think about what I was going to say next.I began to use my __16__ to look around the room to see how my students were reacting to what I had just said.When I saw their __17__ wander，I tried to bring them back.When I saw them puzzled over some concept that I thought I had __18__，I gave another example.My __19__ became less organized and less brilliant，but my students seemed to __20__ me better.

　　【解题导语】　这是一篇记叙文。作者踏上大学的讲台之前向老教授学习教学方法，其中一位数学教授的教具是一杯咖啡，这给作者留下了深刻的印象，在以后的教学生涯中，一杯咖啡令作者回味无穷。

　　1．A.wasted B．cost

　　C．killed D．spent

　　解析：选D。词语辨析题。句意： 我已经花费了很长时间学习教什么。cost的主语是物，故排除； kill one's time"消磨某人的时间"。

　　2．A.manage B．copy

　　C．teach D．consider

　　解析：选C。逻辑推理题。根据"learning what to teach"可知此处是说没有学怎样教(teach)。

　　3．A.put up B．build up

　　C．take up D．make up

　　解析：选D。逻辑推理题。make up for"弥补，补偿"。根据前文所述可知，此处是说学校想利用一个周末来弥补(从有经验的教授身上学习怎么教)。

　　4．A.experiences B．plans

　　C．presentations D．designs

　　解析：选C。前后照应题。句意： 同事们就他们所使用的教具做了精心准备的演讲。我很欣赏他们的介绍，但他们讲的我都没有记住。前一句中的presented有暗示。

　　5．A.alone B．absent

　　C．lonely D．awkward

解析：选A。词语辨析题。分析语境可知，在休息期间我发现自己独自一人，然后就和一位数学教授聊起天来，alone强调一个人而未必孤独； lonely强调孤独、寂寞。