[解析]
76.Some bottles dropped onto the floor.根据下文( Walking over to take a look) Oh,so many bottles!可知是瓶子发出的声音.故答案应为:Some bottles dropped onto the floor.
77.Why do you collect bottles?根据下文Because I 可知上文问的是某种原因,故答案为:Why do you collect bottles?
78.That's an interesting idea.根据上文I want to make toys out of them.可知此处是对这一想法的评价.故答案为:That's an interesting idea.
79.Have you already made some toys?根据下文Yes,quite a few.可知是在问"有没有一些…"故答案为:Have you already made some toys?
80.Can you show some to us one day?根据下文Of course,I'll bring a few here tomorrow.可知此处要问能不能给我们展示一下.故答案为:Can you show some to us one day?