阅读下面的短文,从短文后各题所给的A、玖C和D四个选项中,选出可以填入空白处 的最佳选项,并在答题卡上将该项涂黑。I was attending my first group meeting in the university lab where I had just started as a postdoc(博士后), and I was pleased that I had managed to 31 most of the discussion. Then, when my supervisor(导师) asked about my previous accomplishments. I 32 . In my home country of Brazil, I had 33 lots to be proud of. But now I was in Washington, and 34 didn’t know the word “accomplishment” meant. When I looked it up later in the dictionary, I realized what I should have said: 35 my research at international conferences, publishing, teaching, and more. But at the time, my 36 could only be “I don’t know.”Shortly after the 37 lab meeting incident, my confidence took another 38 when some of my experiments and analyses didn’t work. The paper I intended to 39 did not come out. I used to be 40 to give talks; now, I was asked to speak more 41 because of my accent. My 42 was shattered(粉碎). Could I only be successful in my own country? After months of 43 , I reminded myself to regain my lost confidence. I started to 44 my new environment. I grasped opportunities to 45 with others, which forced me to talk more. It was 46 at first, but with practice I gradually felt more confident in my English. I began to receive 47 feedback on my presentations.Now after 2 years I’m so proud of how 48 I’ve come. I’ve presented my research at several international conference, and I’ve had my own papers published. 49 , my confidence is back. I feel like an immoral (不朽的) soldier. I’ve experienced difficulties and 50 only to become even stronger than before.31. A. open up B. join in C. follow D. hold 32. A. hesitated B. laughed C. refused D. froze33. A. donated B. evaluated C. achieved D. instructed34. A. even B. always C. naturally D. sometimes 35. A. performing B. presenting C. pursuing D. directing 36. A. result B. research C. response D. explanation37. A. minor B. separate C. extraordinary D. embarrassing38. A. chance B. hit C. step D. break39. A. publish B. write C. copy D. Read40. A. urged B. invited C. ordered D. encouraged41. A. freely B. slowly C. formally D. frequently42. A. hesitation B. confusion C. confidence D. imagination43. A. self-doubt B. self-control C. self-motivated D. self-assignment 44. A. improve B. explore C. get used to D. make use of45. A. interact B. fight C. stay D. work45. A. interact B. fight C. stay D. work46. A. meaningless B. ridiculous C. useless D. scary47. A. informal B. accurate C. positive D. personal48. A. endlessly B. quickly C. fast D. far49. A. In short B. As a result C. To be honest D. By contrast50. A. glories B. failures C. departures D. meetings