单项选择题

[听力原文]8-10
W: Excuse me. Do you know how this works
M: Yes. Put the washing inside.., shut the door.., the money goes in here. Then when the machine starts you have to put the soap powder in through here.
W: Is that all
M: Yes.
W: But is there anything I should do when it works
M: You don’t have to do anything else until the machine stops.
W: Thank you so much.

What should the man do first（）

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