ARLINGTON, Texas - A two-time “Teacher of the Year” in Arlington is now fighting to keep her job after allegedly telling a Hispanic student to “Go back to Mexico.” Barnett Junior High School math teacher Shirley Bunn has 24 years of teaching experience. But her career could end with what she called a moment of frustration. Bunn admitted she lost her temper on Sept. 30 while distributing Title 1 forms to her eighth grade students. According to public documents, a student who had a history of being disruptive repeatedly asked his teacher for a form printed in Spanish by saying,...