In January 2002, during the first weeks of a six-month stay at the Children’s Hospital of Philadelphia for leukemia (白血病) treatment, Michael wandered over to his hospital window in search of relaxation. The (36) first-grade Watched a construction crew (37) on a 10-story addition to the hospital. (38) Michael’s third-floor window, Ritchie, an iron-worker from the East Falls section of Philadelphia, (39) and saw "this kid with no hair (40) face was pressed up to the window. I waved, and he smiled and (41) . I’ll never forget that," says Ritchie, a father of three.As winter (42) spring, Michael watched, fascinated (着迷), as 3 000 tons of steel (43) formed the skeleton of the building. One day he colored a message for the crew and held (44) up to the window: Hi, Local Iron Workers. I’m Mike. Ritchie and the (45) crew messaged back: Over the (46) months, as his treatment continued, Ritchie and the crew (47) Michael up and cheered him with (48) signs like Be Strong Mike. (49) the construction reached the third floor, Ritchie jumped across the (50) between the buildings and the two had a (51) chat. The hard hat with the tender heart wells up (涌出眼泪) when he thinks about it. "Michael (52) my life," says Ritchie. "I was a real hard-core (顽固不化的) person without a lot of sympathy. But I’d (53) seeing this kid every day waving at me and excited about the construction. I look at life (54) thanks to him.” Today Michael is a 10-year-old third-grader in complete recovery. What does he hope to (55) when he grows up "A construction worker," he says. 44().

A. that
B. it
C. one
D. itself