广东省2012英语试卷的语法填空第20空应该填什么?

广东省2012英语试卷的语法填空第20空应该填什么?
Mary will ever forget the first time she saw him .He suddenly appeared in class one day ,__16_(wear) sun glasses .He walked in as if he __17___(buy) the school ,And the word quickly got around that he was from New Youk City .
For some reason he sat beside Mary.Mary felt _____18_(please ),because there were many empty seats in the room .But she quickly realized that it wasn’t her ,it was probably the fact that she sat in __19___last row .
_20__ he thought he cloud escape attentiong by sitting at the back ,he was wrong .It might have made it a little _____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 turnd to look at him ,they had to look at Mary ,_22__made her feel liake a star .
“Do you need those glasses for medical reasons ” the techer 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