Robots are smart. With their computer brains,they help people work in d1. places or do difficult jobs. Some robots do regular jobs.Bobby, a mail carrier, brings mails to a large o2. building in Washington DC. He is one of 250 mail carriers in the United States.

Mr Leachim, who weighs two hundred pounds and is six feet t3., has some advantages as a teacher.One is that he does not f4. details (細(xì)節(jié)). He knows each child’s name, the p5.names and what each child knows and needs to know.In addition(另外), he knows each child’s pets and hobbies. Mr Leachim does not m6. mistakes. Each child goes and tells him or her name,then dials(撥打) an identification（辨認(rèn)） number.His computer brain puts the child’s voice and number t7.. He identifies the child with n8. mistakes.Then he starts the lesson.

Another advantage is that Mr Leachim is flexible（靈活的）. If the child needs m9. 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 i10. about their hobbies. At the end of the lesson the children switch Mr Leachim off.

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