Today’s World is mainly about______.

M: Hey, Sis. Are you interested in buying some used books for school? You can really save some money that way.
W: Well, what do you have?
M: Well, let’s see.(1)I have a book called Today’s World, talking about changes of earth since ancient times, and I’m selling it for thirty dollars.
W:(2 - 1)Thirty? That’s a little expensive for a beat-up book like that.
M:(2 -2)Maybe so, but I bought it for sixty. Plus, I wrote a lot of notes in the book that should help you with the class...if you could read my writing.
W: What else are you selling?
M: Okay, I have English writing textbook for fourteen dollars, a math book for twenty-three, and a novel for only seven bucks. It’s up to you. You know, these things go fast. I mean you have to listen to my advice as your older brother.
W:(3)I’ll take the English book, and other two books you’ve just mentioned. I need all of them for sure. I think I’ll hold off on buying other books for now. Teachers are always changing their minds about textbooks. And, what are those books?
M: Which ones? Ah, ah, nothing. Never mind.
W: Wait, wait, wait. Finding Your Perfect Someone. You’re selling it for forty dollars? What’s this all about? And the price? Forty dollars? That’s a little expense.
M: Well, Well. It’s a...(4)It’s just a marital relations class. You know about finding a partner. But, ah, never mind. You would never understand.