A: Hey, Amy! Look at my new schoolbag.

B: Oh, it's pretty.

A: Yeah, it's the newest style. My uncle sent me it. He also bought me a book. Let me show you.

B: Oh, it's Harry Potter! That's so cool.

A: Yeah, I like Harry Potter a lot.

B: But isn't it heavy? It's probably the thickest book among all my books!

A: Yeah, it's kind of heavy, but I'm strong, haha. Look, I also have some color pencils.

B: Do you like drawing with color pencils?

A: Yes, I do. I use them to draw every day.

B: What color do you like most?

A: I like ...

B: Hold on, let me guess, hmm, do you like yellow and blue most?

A: Yes! How do you know?

B: That's easy. Which pencil is the shortest?

A: The yellow one and the blue one. Why?

B: They are the shortest because you use them more than the other pencils, so I guess you like them most.

A: Oh, yeah. No wonder they say you're the smartest boy in our class. You must can tell that I like purple least then.

B: Yeah, because the purple pencil is the longest.