A. 用方框中所给单词的适当形式填空,每个单词限用一次。
promise provide challenge fail completely
As a shy person, I find making new friends really 51. . I see my classmates talking and laughing so easily, and I just want to join them. Every morning, I make 52. to myself to be braver and to just say "hello". However, when a real chance 53. , like during a group project, my mind just goes blank. I'm so afraid that I will 54. to say the right thing and end up looking foolish. I feel 55. alone in a crowded room. I long for friendship, but my shyness builds a wall around me that seems difficult to break down.

51. challenging 52. promises 53. is provided 54. fail 55. completely

【解析】
51. 结合语境，害羞的人认为结交新朋友具有挑战性，此处需形容词作宾语补足语，故填challenge的形容词形式challenging。
52. 固定搭配make promises to oneself意为“对自己承诺”，此处应用promise的复数形式promises。
53. 句中“机会”是被提供的对象，需用被动语态，主语a real chance为单数，故填is provided。
54. 固定短语fail to do sth.表示“没能做成某事”，will后接动词原形，故填fail。
55. 此处需副词修饰形容词alone，completely表示“完全地”，能突出孤独的程度，符合语境，故填completely。
【答案】
51. challenging 52. promises 53. is provided 54. fail 55. completely
【知识点】
形容词变形、被动语态、固定短语搭配
【点评】
本题考查词汇的适当形式运用，需结合上下文语义，掌握词性转换、被动语态及固定短语等知识点，对学生的语境分析能力和词汇综合运用能力有一定考查。
【难度系数】
0.5