求助一道英語完形填空題
US President Obama knows it's not easy to be a star student,but he also doesn't belive in g___ up on yourself or your education .He told Wakefield High School's students a___ his own hardships at school .His father left the f___when he was only 2 years old,and his mother worked hard just to p____the bills.He felt d___from his classmates,and lonely.These challenges made it more difficult for him to f___on his schoolwork.But,the President said,"the circumstances of your life are not an excuse for neglecting your homework or having a b___ attitude in school.That's no excuse for talking back to your t___,or cutting class,or dropping out of school.There is no excuse for not trying."
"I expect you to p___your best effort into e___you do.I expect great things from each o you."