题目

When I was thirteen, an eight-grader hit me in the stomach. And this made me___1___. I told Nana that I wanted to beat him before she began to give one of hour-long talks. Among other things, I remember she told me that I didn’t need to worry about the boy. “Every good deed will come back to you some day, ” she said.It took me___2___to understand the meaning. Nana was living in a board-and-care home in California. Each Tuesday, I took her out to___3___. I would always find her___4___in a chair right by the front door. I remember our very last dinner together___5___she went into the hospi我们可以利用矿泉水瓶做小实验来说明一些物理知识．①双手挤压空矿泉水瓶可以使瓶子变形，如果施加的力增大，瓶子变形程度就加大，这表明力的作用效果跟力的______有关；②在空矿泉水瓶侧壁不同高度的地方锥出上、下两个小孔，往里面倒满水，可以观察到水从两个小孔流了出来，其中下孔流出的水喷得最急，这表明液体的压强随深度的增加而______；③往空矿泉水瓶内注入少量的热水，摇晃后倒掉并立即盖紧瓶盖，过一会儿发现瓶子慢慢向内凹陷，这说明______；④将空矿泉水瓶放倒在水平桌面上，用力向它的侧面吹气它会滚动，但用同样的力向它的底部吹气它却不容易滑动，这表明在压力相同的条件下______．