完形填空。 I am a people watcher, a trait magnified when I travel. On the train to and from Tokyo, I realized, 1 , that my fellow riders who were Japanese rarely 2 up and around or used their eyes to interact with other people. This 3 me at first. To my American mind such interaction has the 4 of mutual (相互的) acknowledgement. But  then  I remembered 5 that the Japanese rarely maintain direct eye contact. Perhaps my people watching seemed 6 . I tried to be more subtle (细心的). I had also read how the Japanese feel 7 to each other as a group by a sense of responsibility. 8 , as a Caucasian Westerner, I was obviously an outsider, I often 9 being a temporary member of the group. Once, sitting at a long stop of a local train, I 10 as several people got up and left the car when a faster train to their 11 pulled into the station. It was cold outside and every person 12 to press the 'CLOSE' button as they exited the train doors to help keep out the cold air for the group 13 onboard. I always feel a bit embarrassed at having the unearned good fortune of being a 14 speaker of the language. In Japan I was 15 for the many kind strangers who were willing to use their English to 16 me. And in a country where the Roman alphabet is not used in the local language, the abundant English signage was 17 aimed at helping travelers. For the most part on this trip, I found that I was left alone until I asked for help.I 18 little curiosity or interest in interacting with me.   When I entered a restaurant or shop, I felt I was 19 as a local resident would be. Welcome is the greeting often shouted out 20 by the staff when customers enter restaurants or stores. (     )1. A. however (     )2. A. looked (     )3. A. surprised (     )4. A. character (     )5. A. reading (     )6. A. polite (     )7. A. upset (     )8. A. As though (     )9. A. benefited from (     )10. A. observed (     )11. A. home (     )12. A. made sure (     )13. A. come (     )14. A. foreign (     )15. A. thankful (     )16. A. hit (     )17. A. obviously (     )18. A. realized (     )19. A. welcomed (     )20. A. coldly B. though B. noticed B. satisfied B. nature B. seeing B. gentle B. separated B. Even though B. took from B. recognized B. destination B. promised B. left B. national B. appreciative B. call B. specially B. sensed B. loved B. warmly C. yet C. discovered C. puzzled C. moral C. thinking C. rude C. lonely C. Though C. got from C. found C. office C. wished C. remained C. native C. hateful C. help C. particularly C. felt C. arranged C. hearty D. therefore D. wandered D. wondered D. quality D. understanding D. noble D. connected D. Unless D. moved from D. watched D. company D. guarantee D. stood D. natural D. grateful D. hurt D. clearly D. knew D. treated D. kindly