增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1).每处错误及其修改均仅限一词；

2).只允许修改10处，多者（从第11处起）不计分。

    Our class paid a visit to a senior's home last Sunday.As soon as we got to there,we first did a thorough cleaning. Some swept and mopping the floor.Some cleaned the windows or others did some washing.An hour late,the rooms looked clean and tidy and took on a newly look.Then we were divided into two group.One group gave a wonderful performance who the elderly enjoyed very much;the other group taught those interested in English some daily expressions.All the elderly had good time with them.When lunch time came,we had to say goodbye for them.

美国独立后，经过两百多年的扩展，形成了从大西洋到太平洋的广阔版图。在扩展有形边疆的同时，美国还在全世界进行着政治、经济、军事等无形边疆的扩展。从二战结束到50年代美国进行“无形边疆扩展”的经济行为是

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