Barack Obama is one of the most powerful people in the world.
In a speech, he o     his success to those hardships he went through: “I was nobody at first, but I wanted to make a d    . I learned the ______(精神) of perseverance(坚持不懈) from people around me. L       a hard life, my mom struggled to put herself through school, and make ends m    . My grandmother kept doing her job as well as she could and ended ______ being vice president at a bank. ________ you do, remember that making your mark on the world is hard. Be patient and determined, r       of the setbacks and failures you may _______ across in achieving success. No one of achievement has________(躲避) failure. They learn from mistakes and don’t quit.”