A few months back while sitting in a boat fishing with a couple of friends, I noticed a field mouse on the river bank. He _16_ (appear) out of his hole, darted( 猛冲) in a couple of directions, and then scurried( 碎步疾跑) back. I thought of the existence of this little creature. His life is spent _17_ (run) around, frightened. He darts here, scurries there, turns in circles, _18_ never really sees much beyond his nose. He is trying to sniff his way to successful living, _19_ defined, by a mouses exi
