The most dishonest thing I have ever done

I think all of us have done dishonest things, so have I. And actually, I can't remember how much this kind of things I've done. But I can share the most impressive one with you.

When I was at the fourth grade in the elementary school, I had a lot of reference books. And because my parents are both teachers, they will keep a close watch on my homework. I always felt pressured about that. One time, my father asked me to take my sciencs reference book to let him check out whether I've done. Actually,I hadn't done the exercises. But I was not afraid of him because I had had prepared for it. I copied the answers on the back of the book, and used my red pen to check to pretend that I had marked corrections on it. I happily bring the book to my father and he said " You did a great job." Honestly, this thing haven't been disclosed from then on. I have kept this secret in my heart for a long time. When I recall it now, I feel how I was dishonest then. And I hope I will never lie to my parents again.