Uncle Wang is fifty. He has two sons, Wang Lei and Wang Fei. They are twins. They are twenty -two. Wang Lei likes making things. He makes many different things. Today he's making a machine. He wants to ride the machine like a bike and fly it like a plane. Wang Fei doesn't like making things at all. He likes reading and watching TV very much. He plays table tennis on Saturdays and Sundays. Wang Lei and Wang Fei like playing football a lot. Uncle Wang likes his two sons very much. They love each other, too. Wang Lei and Wang Fei are   _  .
Uncle Wang's sons students teachers friends