Paul Lucas can often be seen walking around the city of San Francisco. Sometimes people are ____ (surprise) to see him walking without any shoes or socks,____ Lucas doesn't mind at all. He likes to walk barefoot, and ____ do 640 other members of Dirty Sole Society, the club that Lucas ____ (start) years ago. Lucas' idea for this is to encourage others to live ____ (free)－free of shoes.

    According to Lucas, the barefoot life has many ____ (advantage). The most important is simply that it feels good. He also says that walking barefoot allows you to experience the world directly by ____ (touch) it with your feet. In addition, the feet do not smell so much ____ they stay dry,____ (make) it hard for bacteria(细菌)  to grow. And, of course, walking barefoot keeps your feet in good shape, so it's actually ____ (healthy) than wearing shoes.