Human history begins with stories. Some stories are so important that they    1    （pass）down for countless generations. And storytelling is a useful tool,     2    gives a lesson much more powerfully than other ways. For example, once I had to tell actors to be on time for a performance. Instead of    3    （repeat）the time over and over again, I told them a true story. “The year before, one of the actors was late. We replaced him so he didn’t get a chance to perform.” Then, no one    4    （be）late again.