21 Teachers depend on more than their own experiences to impart a set of values to students and to teach them to become responsible citizens. (A) Teachers mainly use their own experiences to help students see the values and responsibilities of the younger generation. (B) Based on their own experiences, teachers help their students develop a set of values and a sense of responsibility. (C) Teachers employ various ways, including their own experiences, to foster a set of values and a sense of responsibility in students. (D) Teachers prefer not to use their own experiences to help students develop a set of values and become responsible citizens.