填空。 When I began teaching in a university, I was invited to a workshop for new professors. I had __1___ a long time learning what to teach, but not learning how to _2_ it . somehow , my university seemed to hope a weekend spent with experienced professors woule __3_ for that. My colleagu8es presented well-crafted lectures about the tools they used. I enjoyed their _4_, but do not remember a thing they said. At a coffee break during the lectures, finding myself _5_, I turned to a mathematics professor staning nearby. I asked him what his favorite teaching __6_ was. ' a cup of coffee,' he said ' I talk too much and too fast in the classroom. Students sometimes have trouble _7_ me. So when I've said _8_ that I ant my students to think about,  I would _9_ 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 _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. Whe 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. (     ) 1.   A. wasted (     ) 2.   A. manage (     ) 3.   A. put up (     ) 4.   A. lecture (     ) 5.   A. alone (     ) 6.   A. method (     ) 7.   A. following (     ) 8.   A. everything (     ) 9.   A  pretend (     )10.   A. observed (     )11.   A. suggested (     )12.   A. empty (     )13.   A. discovery (     )14.   A  dropped (     )15.   A. space (     )16.   A. chance (     )17.   A. attention (     )18.   A. translated (     )19.   A. speeches (     )20.   A. realize B. cost B. copy B. build up B. speech B. absent B. material B. grasping B  something B. stop B. noticed B. protected B.  clear B. invention B. made B. time B. pause B. focus B. expected B. memories B. understand C. killed C. teach C. take up C. story C. lonely C. tool C.  seizing C. nothing C. prevent C. glared C. allowed C. large C. magic C. drank C. room C. situations C. energy C. explained C. documents C. admit D. spent D. consider D. make up D. experience D. awkward D. skill D. imitating D. anything D. delay D. proved D. advised D. false D. idea D. changed D. schedule D. conditions D. devotion D. solved D. lectures D. admire.