Welcome to ____ (I) room. Look at the photo ____ the wall. You can ____ (see) my parents, my sister and me in the photo. Look! This is my jacket. It is ____ . My hat is blue, too. They ____ (be) on my bed. Oh, can you see the model plane?____ looks very nice . You can see my books ____ pencils are on the desk. ____ is my baseball? It's ____ on the desk. It's under the chair. Do you want to make friends(交朋友) with me? You can call me ____ 689-5265.

I often meet uncle Sam on my way ____.

“业余侦探”小星发现两个并拢的“可疑”鞋印。为了估测那个人的体重，小星在方格纸上描下一只鞋底接触地面部分的轮廓如图，图中每个小方格的面积是5cm²。测量时，凡大于半格的都算一格，小于半格的都不算。为了测量压强，他在紧挨鞋印旁边地面用压力测力计竖直向下压一薄垫片，垫片的重力不计，与地面接触的面积是10cm²，当垫片下陷的深度与鞋印的深度相同时，测力计读数是15N.根据以上数据，试求（g取10N/kg）：

（1）垫片对地面的压强；（2）“可疑”人的质量。