In January 2009, 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【C1】______ first-grader watched a construction crew【C2】______ on a 10-storey addition to the hospital.【C3】______ Michael' s third-floor window, Ritchie, an iron-worker from the East Falls section of Philadelphia,【C4】______ and saw " this kid with no hair【C5】______ face was pressed up to the window. I waved, and he smiled and【C6】______ . I'll never forget that," says Ritchie, a father of three. As winter【C7】______ spring, Michael watched, fascinated (着迷), as 3,000 tons of steel【C8】______ formed the skeleton of the building. One day he colored a message for the crew and held【C9】______ up to the window: Hi, Local Iron Workers. I' m Mike. Ritchie and the【C10】______ crew messaged back. Over the【C11】______ months, as his treatment continued, Ritchie and the crew【C12】______ Michael up and cheered him with【C13】______ signs like Be Strong Mike.【C14】______ the construction reached the third floor, Ritchie jumped across the【C15】______ between the buildings and the two had a【C16】______ chat. The hard hat with the tender heart wells up (涌出眼泪) when he thinks about it. "Michael【C17】______ my life," says Ritchie. "I was a real hard-core (顽固不化的) person without a lot of sympathy. But I' d【C18】______ seeing this kid every day waving at me and excited about the construction. I look at life【C19】______ thanks to him. "Today Michael is a 10-year-old third-grader in complete recovery. What does he hope to【C20】______ when he grows up? "A construction worker," he says.