完形填空。 A group of graduates got together to visit their old university professor.They talked about the 1 topic-happiness.But soon their conversation turned into complaints about 2 in work and life. To offer his guests coffee, the professor went to the kitchen and 3 with a large pot of coffee and a variety of 4 -plastic,glass, metal, porcelain (陶瓷), som  plain-looking  some  very 5 .The professor told his students to help themselves to hot coffee. When all the students had a cup of coffee in 6 . the professor said:'lf you have noticed, all the nice-looking 7 . cups were taken, leaving behind the plain and cheap ones.While it is 8 for you to want only the best for Yourbelves, that is the 9 of your problems and stress.The professor continued,' Believe that the cup itself adds no 10 to the coffee.ln most cases it is just more expensive and in some cases it even 11 what we drink.What all of you 12 wanted was coffee, not the cup, but you consciously went 13 the best cups.Now 14 this: life is coffee, the jobs, money,and 15 in society are the cups9 which are just tools to hold and 16 life, and the different typesof cups we have don't decide, nor 17 the quality oflife.lf we concentrate only on the cups, we will 18 to enjoy the coffee in it.So don't let the cups 19 you...enjoy the coffee instead.' At these words, the graduates looked at each other in 20 embarrassment. (     )1. A. hot (     )2. A. pay (     )3. A. cooked (     )4. A. cups (     )5. A. common (     )6. A. order (     )7. A.  pretty (     )8. A. necessary (     )9. A. situation (     )10. A. quality (     )11. A. makes (     )12. A. finally (     )13. A. for (     )14. A. forget (     )15. A. position (     )16. A. create (     )17. A. damage (     )18. A. come (     )19. A. drive (     )20. A. quiet B. sensitive B. joy B. took B. gifts B. special B. time B. different B. normal B. answer B. energy B. gives B. really B. with B. discuss B. relation B. support B. determine B. stop B. hold B. speechless C. famous C. experience C. returned C. plates C. rare C. hancl C. colorful C. good C. result C. weight C. hides C. especially C. off C. consider C. workmates C. contain C. change C. have C. take C. amazing D. easy D. stress D. met D. drinks D. delicate D. place D.  expensive D. possible D. source D. color D. includes D.  nearly D. to D. try D.  friends D. own D. increase D. fail D. control D. reasonable