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，每处错误仅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限一词。
2.只允许修改10处，多者（从第11处起）不计分。
Last Sunday I saw a worst storm in years．It came sudden and went on for over three hours．After lunch, I went into my room to have a rest．The air was hot, but all was quiet．Then a strong wind started to blow into my room．Pieces of paper on my desk flew high into the air and some flew out the open window．As I ran out to catch it, big drop of rain began to fall．When I come back into the house, it was raining more harder and harder．Then I heard a loud crashing sound from the back of the house．When I ran out to find out that had happened, a big tree had fallen down and broke the top of the backroom．