读两半岛轮廓图，回答下列问题。

魔术是深受同学们喜爱的节目，其中包含着许多科学原理。图甲是某同学自制的一只魔术箱，表演时他将开口的方形空箱面展示给观众，把纸币从空箱顶端的投币口投入，结果纸币“不翼而飞”。原来魔术箱中有一块平面镜（如图乙），它与箱底的夹角为                   度，使观众觉得箱子里没有东西。观众不能看见平面镜后面的纸币是因为光具有                       性质。

Mark: That's great! Anything interesting?

Tracy: Yes, working at an____park.

Mark: Wow, that sounds____ !

Tracy: So, have you found anything?

Mark: Nothing yet, but I have a ____ of leads. One is working as an intern for a record company-mostly answering phones. Or I can get a landscaping job again.

Tracy:____ an intern sounds more interesting than landscaping. You'd have better hours, and it's probably not as much work.

Mark: Yeah, but a landscaper earns more than an intern. And you get a great tan!