根据对话内容, 运用方框中所给的句子选项补全对话。其中有一项是多余的。（5分）
晚饭前Anti Cindy 正在和Bob 谈论关于网上购物的话题。
Bob：  Aunt Cindy, do you shop online often?
Cindy：Yes. It's very convenient and the price is even lower.
Bob： Are there many things online?
Cindy：Sure. ______ Let's check it out online!
Bob： Oh, what's this? Second-hand cell phone store?
Cindy：Yeah, this one is very famous with a good credit among on-line customers. _____ If you want to change your cell phone for a new one, you can sell the old one here.
Bob： Really? How to do that?
Cindy：Take some pictures of the thing you want to sell, then upload it onto line with a simple description about it and leave your phone number. ______
Bob： That's amazing. I'd love to try it later. Oh, an on-line supermarket?
Cindy：Let's click to check it out.
Bob： Oh, I got it. It is similar to the real supermarket, which makes it feel so real. _____ She loves shopping in supermarkets.
Cindy：Sure it is!  ______ It's a real revolution （革命）about people's shopping habits.
Bob:  Really! Especially when we are busy, we can get things without going out. Oh, dinner is ready.
Cindy: Let’s go first!

A: It is difficult to shop online. B: Mom will love it. C: You can find everything all over the world. D: Shopping online will get more and more popular. E: Then your stuff will be sold. F: It's like an open free market.