短文改错

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，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。

    Thanksgiving Day is one of the most important family holiday in America. All the members of a family, no matter where far away they are, will try to get together on that day. The first Thanksgiving in America takes place in October, 1621. In 1620, the group of Englishmen sailed to Massachusetts. They had expected to find a freely place to live in, so they experienced a hard winter. Half of them starved death. The next spring, we began farming. With the help of local Indians, they learned to be plant corn and raise animals. In the autumn, the fields produced a good harvest. Filling with joy and thanks to God, they held a celebration. In 1863, it became a national holiday.

A盐酸   B氯化钾   C氧化铜   D淀粉

E五氧化二磷   F氮气   G氢氧化钙   H甲烷