题目内容：

Have you ever had a case 1. a mistake helped you understand an idea or a skill? For me, it was sailing. I took a sailing class when I was in high school. No matter how many times I read the 2. (explain), I could not understand the difference between a “tack" and a “jibe”---two methods of turning a boat ---one much 3. (safe) than the other. Later, one day, when I was sailing, a heavy wind blew up. We needed to head back, 4. I mistook the “tack” for the “jibe” and pushed the boat in the wrong direction. Before I realized 5. (I) mistake, it was too late. Luckily, no one 6. (hurt). Only after this experience did I 7. (clear) understand the sailing phrase “turning on the wind” that I 8.(read) so many times in the textbook.I never confused a “jibe” with a “tack” again! Now I often share this story 9. my students after they have made mistakes. I hope they can learn something from their mistakes and correct them instead of10. (regret) all day.