[解析]
【小题1】根据A问的Where did you go last weekend?"上个周末你去了哪里?"可知此处需用B回答去的地方.【小题2】根据B说的But most of my friends went,so I went with them."但是我的朋友们大部分去了那里,所以我和他们一起去的".可知此处需问那里饿原因,故此处为Why did you go there then?【小题3】根据B说的I told the old people something interesting around us."我给老人们讲了一些我们周围的一些有趣的事情",可知此处A问他在那儿干什么了.故为What did you do there?【小题4】根据B说的I had fun and felt happy."我玩得开心,而且感觉幸福",可知A问他的感觉如何.故为How did you feel?【小题5】根据A说的Next time,I'll go with you."下次,我要和以一起去"可知他认为去哪里是有趣的.故此处为That's great.