2012年广东高考英语题,语法填空网上参考答案2疑问,

2012年广东高考英语题,语法填空网上参考答案2疑问,
Mary will never 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 York 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 could escape attention 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 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 the 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.”
请问17题,填had bought 还是 would buy?24填 what,还是whether/if?