A: What did you buy in the Computer World yesterday?B: __51_

A: What did you buy in the Computer World yesterday?
B: __51__I want to use it to record.
A: __52__
B: Well, I haven’t known yet._53___
A: Oh, no! You should read the instructions first.
B: __54__If you want to turn on the recorder, press the blue button”.
A: Look! It works. How do you save your video?
B: __55__
A: You’ve done that! Let’s try something to record.