综合填空：

　　Robots are smart．With their computer brains, they help people work in d 　　1　　 places or do difficult jobs．Some robots do regular jobs．Bobby, the mail carrier, brings mail to a large o 　　2　　 building in Washington D．C．He is one of 250 mail carries in the United States．

　　Mr．Leachim, who weighs two hundred pounds and is six feet t 　　3　　, has some advantages as a teacher．One is that he does not f 　　4　　 details．He knows each child’s name, the p 　　5　　 names and what each child knows and needs to know．In addition, he knows each child’s pets and hobbies．Mr．Leachim does not m 　　6　　 mistakes．Each child goes and tells him or her name, then dials an identification number．His computer brain puts the child’s voice and number t 　　7　　．He identifies the child with n 　　8　　 mistakes．Then he starts the lesson．Another advantage is that Mr．Leachim is flexible．If the child needs m 　　9　　 time to do their lessons they can move switches．In this way they can repeat Mr．Leachim’s lesson over and over again．When the children do a good job, he tells them something I 　　10　　 about their hobbies．At the end of the lesson the children switch Mr．Leachim off．