Are you doing your homework for your Advanced English course? There is one text entitled "Mark Twain, the Mirror of America". If you have learned this lesson, you should know how to work out a brief conclusion .If you have not, you may have a try. What's more, it seems you are not a qualified student, for you even refused to do homework by yourself! It's cheating. Today you cheat your teacher,tomorrow you'll be cheated by life or society. Be an honest person and you'll be rewarded.