题目

When I was in the seventh grade, I was a volunteer in a hospital. I spent most of the time there with Mr. Green. He never had any   16  and nobody seemed to care about his living  17. I spent many days holding his hand, talking to him and   18  anything that needed to be done. He became my close friend,  19  he only responded with an occasional (偶尔的) squeeze (捏) of my     20   . I left for a week to visit my parents. And when I came back, Mr. Green was 21   . I didn’t have the   22    to ask the nurses where he was. I was afraid that they might   2如图是搬运泥土的独轮车，设车箱和泥土的总重G＝1000N，运泥土时从A点提起独轮车把手的力是F，F的力臂是 m，F的大小至少是 N.