将下列对话补充完整.（每空一词）
A: Hi, Mike. Why are you walking       this ? What`s wrong    you.
B: I fell down last night.
A: I `m sorry to hear that!     you hurt yourself.
B: Yes, a little.
A: But why did you fall down ?
B: We played a game last night, and I      the chair.
A: Too bad. Don`t worried. Let me help you.
B: It`s very kind      you.