Exercises: Filling 9. The true mark of leadership is not to support what is popular but to make what is unpopular popular. simply 10. I was quite startled to see two old men tossing a base ball h n the par k back and forth9. The true mark of leadership is not _____ to support what is popular but to make what is unpopular popular. simply 10.I was quite startled to see two old men tossing a baseball _____ in the park. back and forth Exercises: Filling