exam

       All students have to sit an examination. If we fail, we alao have time to learn and take it again. If we have a lot of knowledge, we don't fear exam. However, life, in some way, also can be treat as  a kind of examination. In this examination, we have to try our best all the time. If I fail, that must be a regret in my life. So i alway think i know nothing, i am a learner.