Ever thought you could do the job of a network executive, deciding which shows are put on the air and which ones end up in the waste bin?
  Network jobs are hard to come by, but you can weigh in on the decision-making process by letting your opinions be known at the CBS Television City Research Center at MGM Grand.
  Visitors also have a chance to enter a drawing for a state-of-the-art home-theater system by joining Television City's entertainment panel, which will send items for review -- such as commercials and pilot programs -- to participants' homes. Drawings are held every three months.