阅读下面短文，在空白处填入一个适当的单词或括号内单词的正确形式。

Paul Lucas can often be seen walking around the city of San Francisco. Sometimes people are surprised to see him walking 【小题1】 any shoes or socks, but Lucas doesn’t mind at all. He likes to walk barefoot, and so do 640 other 【小题2】(member) of Dirty Sole Society, the club that Lucas 【小题3】 (start) years ago. Lucas’ idea for this is to encourage others to live freely－free of shoes.

Lucas says that walking barefoot allows you to experience the world directly by touching it with your feet. In addition, the feet do not smell so much because they stay dry, 【小题4】 (make) it hard for bacteria(细菌)   to grow. And, of course, walking barefoot keeps your feet in good shape, so it’s actually 【小题5】 (healthy) than wearing shoes.