Proper street behavior. in the United States requires a nice balance of attention and inattention. You are supposed to look at a 【21】______ just enough to show that you're 【22】______ of his presence. If you look too little, you appear arrogant or furtive (鬼鬼祟祟的), too much, 【23】______ you're inquisitive. Usually what happens is that people 【24】______ each other until they are about eight feet 【25】______ , at which point both cast down their eyes. Sociologist Dr. Erving Goffman 【26】______ this as 'a kind of dimming of lights.' Much of eye behavior. is so 【27】______ that we react to it only on the intuitive level. The next time you have a 【28】______ with someone who makes you feel liked, notice what he does with his eyes. 【29】______ are he looks at you more often than is usual with 【30】______ a little longer than the normal. You interpret this as a sign of a polite one 【31】______ he is interested in you as a person 【32】______ just in the topic of conversation. Probably you also feel that he is both 【33】______ and sincere. All this has been demonstrated in elaborate 【34】______ . Subjects sit and talk in the psychologist's laboratory, 【35】______ of the fact that their eye behavior. is being 【36】______ from a one-way vision screen. In one fairly typical experiment, 【37】______ were induced to cheat while performing a task, then were 【38】______ and observed. It was found that those who had 【39】______ met the interviewer's eyes less often than was 【40】______ , an indication that 'shifty eyes' to use the mystery writers' stock phrase can actually be a tip-off to an attempt to deceive or to feelings of guilt. 【21】