Thankful!!!

When I was in high shool and university, I studied very hard, and until now I think I have to be thankful my friends. To be honest,I was smarter than them and they didn't teach me anything, but they often gave me the good questions and I always enjoy finding the easiest answers for them. Because of that, I saw my knowledge was very stable and whatever I told them, I got it very clear, so I recognized they helped me indirectly. I was so lucky because I had friends like that.