根据对话内容，选出适当的选项补全对话。

(at a fast food restaurant)

A: Lily is going to the bank, so she may be a little late.

B: It doesn't matter.

A: OK.

(5 minutes later)

A:

B: 50 Yuan. I have paid by WeChat.

A: It is really convenient now. What can we do if we don't have mobile phones? I can't imagine that.

B: It is reported that we won't have to take a mobile phone with us in the future.

A: Really?

B: We will pay in an easy and quick way.

A: An easy and quick way? What is it?

B:

A: Why?

B:

A: Wow! That sounds unbelievable. I wonder how much science and technology will be able to change our life.

A. Just show our hands when paying.

B. Then let's order the dishes first.

C. Because there is a computer chip (芯片) in our hands.

D. How much did you pay for our dinner?

E. How shall we pay?