Step 2：逐题解答，确定答案。

　　16．wearing。 根据结构可知，此处考查非谓语动词，判断wear的逻辑主语。

　　17．had_bought。 as if后面跟的虚拟语气，表示与过去事实相反的假设。

　　18．pleased。felt为系动词，其后跟形容词，注意please的形容词形式。

　　19．the。考查冠词用法。

　　20．If/Although/Though/While。根据句式结构可知，此处考查连词，根据语义来判断。

　　21．harder。考查形容词的用法，a little用来修饰比较级，结合语境可知。

　　__21__ (hard) for everybody because it meant they had to turn around, but that didn't stop the kids in the class. Of course whenever they turned to look at him, they had to look at Mary, __22__ made her feel like a star.

　　“Do you need those glasses for medical reasons？” the teacher asked. The new boy shook his head. “Then I'd appreciate it if you didn't wear them in class. I like to look at your eyes when I'm speaking to you.” The new boy looked at the teacher __23__ a few seconds and all the other students wondered __24__ the boy would do. Then he took __25__ off, gave a big smile and said, “That's cool.”,22.which。此处考查定语从句。引导非限制性定语从句，并在从句中作主语，指代前面主句的内容。

　　23．for。根据空格位置可知此处应填介词，结合语义可知答案。

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