Nura Tung, a sixth-grader at Carson Middle School, worries for the loss of innocence among the children of Sandy Hook Elementary School where 26 students and teachers were shot and killed during a shooting spree Friday."The worst part is the students are only first-graders," said Nura, 11. "They shouldn't even think about school not being safe. It should just be someplace there are adults and where they learn."Social studies teacher Tiffany Ferguson dedicated her classes Monday to discussing the shooting in Newtown, Conn., that left 28 people dead, including the shooter and his mother. Ferguson began each class with a …