阅读短文，从方框中选择适当的淘并用其正确形成填空，使短文通顺、意思完整。请将答案写在短文后相应题号的横线上。每空限填一词，每词限用一次。方框中有两个词是多余的。 work  help  time   volunteer  for  when  they  with  I  difficult  glad  walk You don’t have to give thousands of dollars to help someone .  Sarah，a girl from Michigan，the USA ,makes a difference just by giving her 66 . Sarah was seriously in 67 she was a baby.  It is 68 for her to move．Sarah has to 69 around with a walker，however，the 11-year- old girl doesn’t give up,  and she uses her experience to help others. Last summer , Sarah 70 three days a week for seven weeks at the Grand Rapids Comprehensive Therapy  Center. She was one of the youngest 71 for “Therapy and Fun',  a program for children with special needs .Her job was to help than and provide them 72 advice and encouragement. Sarah says that she’s 73 she can share knowledge with others ,  and that working at the center  taught her a lot,  'I feel my life is getting better because I can help others in 74 way.”she said .Mary, Sarah’s fourth - grade teacher said that Sarah has the help of other students around her ,  but shows than that she’s there to 75 them , too.