单项选择题

F: What do you usually do in your spare time
M: I like staying at home and DIY.
F: Woo! What do you do particularly
M: I like to make some furniture and family decorations myself.
F: How did you come to like that
M: Well, I once visited one of my friends. He did very well in decorating his own house. I came back and started my own decoration. It costs less. Now I am an expert.

What does the man mean by "DIY"().

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