根据对话情景，在画线处填上适当的单词，使对话完整通顺。
A:Ouch!
B: What is the ____?
A: I missed the chair and _____down.
B: Did you hurt_____ ?
A: No, I am OK.
A: Oh ,look_____your hands! Go and wash them at _____.
A: OK._____is the washroom?
B: This _____, please.