AIn a small village, there is a teacher, a nurse(护士) ,a driver(司机) and a worker.They are good friends. What are their names? One is Mike, one is Jack, one is Tom and the other is John. Mike's, Jack’s and Tom-s children are classmates. John doesn’t have any children He teaches his friends' children at school. Mike has many hens. He gives the driver and the nurse eggs. Jack's child goes to the nurse- s house. The nurse-s house is beside Jack's.( )21. Are the four people good friends?