补全下列对话。
Sally：How was your Labour Day holiday，Rick?
Rick：It was____．
Sally：Where did you go?
Rick：I went to Sanya with my____．
Sally：How did you go there?
Rick：We went there by____．
Sally：Did you go____there?
Rick：No．The weather was a little cold．We went____there．It was fun!
Sally：Sounds interesting!
满足：
，则点P到直线
的最短距离是（ ）