i have met so many friends in my college life. they have exerted enormous influence on my life. however, one of my most impressive friends is my roommate, Li ming.

　　in the class meeting on the first day of school, Li ming did not impress us at all. we started to notice him because he was always late for classes. we were thus impressed by his laziness. i came to know him and his situation because we were roommates and spent much time together: his mother was seriously ill and sick abed in long-term, his father left him and his mother mercilessly. hence, it was him that shouldered the heavy burden of taking care of his sick mother supporting the whole family. Finally, under great pressures, he balanced his life and study perfectly: he was no longer always late, took good care of his mother and even won the scholarship many years in a row.

　　the experience of Li ming can be one of the most convincing cases of the power of persistence and will. he left a deep impression and imposed a durable influence on me. indeed, friend such as him can be regarded as asset and property in our life. we have rights to choose our own friends，but we should also be prudent and sensible enough to choose friends who can bring us “positive energy”.