题目内容：

根据下面短文内容，在短文的空格处填上一个恰当的词，使短文完整、通顺。

Peter’s uncle lives in the country. Once in summer, Peter goes to stay with him a1.weeks. Whenever（无论何时）they go for a walk or drive a 2.and meet somebody, his uncle waves（挥手）to the person. Peter is surprised and says, “ Uncle George, you 3. to know everybody here. Where did you meet them all ?”

“ I don’t know all these people.” answers his uncle. “ Then 4.do you wave to them?” “ Well, Peter,” says his uncle “ If the person5.me, he will be happy. And that’ll make his journey（旅途）6.. 7.if the person doesn’t know me, he will be surprised and say to   8., “ Who is that man ? Why did he wave to me ?” So he will have something to think about, and that’ll make his journey shorter. And I’ll make everybody happy.”