As I held my father’s hands one night, I couldn’t help but notice their calluses(老茧）and roughness. His hands tell the story of his life as a ____16____ ,including all his struggles. One summer, I remember, a drought (旱灾）hit Ontario,turning it into a ____17____ desert.On one og those hot mornings I was picking sweet corn with my dad to fill the last ____18____ from the grocery store.Fifty dozen was all we needed, which ____19____ took twenty minutes.That morning,however,the process didn’t ____20____ quickly.After forty minutes of aimlessly walking in the field,we ____21____ needed twenty dozen.I was completely frustrated and ____22____.Dropping the basket heavily, I declared, “If the store wants its last twenty dozen,they can pick it themselves1”Dad ____23____.“Just think,my little girl,only ten dozen left for each of us and then we’re ____24_____.” Such is Dad----whatever problem he ____25____,he never gives up. ____26____, the disastrous effects of the drought were felt all over our county.It was a challenging time for everyone,____27____ Dad remained optimistic.He ____28____ to be grateful for other things like good health and food on our plated.Only then did I truly begin to ____29____ Dad and his faith that guided us through the hard times. Dad is also a living example of real ____30____.From dawn to dusk,he warks countless hours to ____31____ our family.He always puts our happiness ____32____ his own,and never fails to cheer me on at my sports s ____33____ his exhaustion after long days. His loving and selfless nature has inspired me to become more sympathetic and ____34____ putting others first. Dad，the life ____35____ I have learned from you will stay with me forever.You are my father,teacher,friend and,most importantly,my hero.

A．or
B．for
C．so
D．but