题目内容：

When I began teaching in a university, I was invited to a workshop for new professors. I had _______a long time learning what to teach, but not learning how to ______ it. Somehow, my university seemed to hope a weekend spent with experienced professors would ______ for that. My colleagues presented well-crafted lectures about the tools they used. I enjoyed their ______, but do not remember a thing they said.

At a coffee break during the lectures, finding myself ______, I turned to a mathematics professor standing nearby. I asked him what his favorite teaching ______ was. “A cup of coffee.” he said, “I talk too much and too fast in the classroom. Students sometimes have trouble ______ me. So when I’ve said _______ that I want my students to think about, I would ______ and take a sip 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 ______ there was not a trace of coffee in it. “My doctor ______ me to stop drinking coffee,” he explained. “So I have always used a(n) _______ cup.” I decided to try his ______ in my class.

I took a cup of coffee with me to my next class. It helped. My pauses, as I ______ the coffee, not only gave my students ______ 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 ______ to look around the room to see how my students were reacting to what I had just said. When I saw their ______ wander, I tried to bring them back. When I saw them puzzled over some concept that I thought I had ______, I gave another example. My _______ became less organized and less brilliant, but my students seemed to ______ me better.

1.A. wasted    B. cost    C. killed    D. spent

2.A. manage    B. copy    C. teach    D. consider

3.A. put up    B. build up    C. take up    D. make up

4.A. experiences    B. plans    C. presentations    D. designs

5.A. alone    B. absent    C. lonely    D. awkward

6.A. method    B. material    C. tool    D. skill

7.A. following    B. grasping    C. seizing    D. imitating

8.A. everything    B. something    C. nothing    D. anything

9.A. stop    B. pretend    C. prevent    D. delay

10.A. observed    B. noticed    C. glared    D. proved

11.A. suggested    B. protected    C. allowed    D. advised

12.A. empty    B. clear    C. large    D. false

13.A. discovery    B. invention    C. magic    D. idea

14.A. dropped    B. made    C. drank    D. changed

15.A. space    B. time    C. room    D. schedule

16.A. chances    B. pauses    C. situations    D. conditions

17.A. attention    B. focus    C. energy    D. devotion

18.A. translated    B. expected    C. explained    D. solved

19.A. speeches    B. memories    C. documents    D. lectures

20.A. realize    B. understand    C. admit    D. admire