短文改错。
假定英语课上老师要求同桌之间交换修改作文， 请你修改你同桌的作文。文中共有10处错误， 每句中最多有两处。错误涉及一个单词的增加，删除或修改。
增加：在缺词处加一个漏字符号?，并在其下面写出该加的词
删除：把多余的词用斜线?… 划掉。
修改：在错的词下面划一横线， 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。
Today is my Dad's birthday. This afternoon I went to the shopping center downtown and
bought present for him. Then I take the subway train home. Sitting on the train, I thought my dad would
be very happy when I saw the present. At the next station, an old lady with two heavy bags got in the
train and stood in the front of me. She looked tiredly. I hesitated for a moment, and then offered my seat
to hers. The old lady thanked me a lot and seated down. Seen her smile, I felt happy. I will always be
ready to help other in the future.
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