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，并在该词下面写出其修改后的词。
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。
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 hotter, and all is 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 them, big drop of rain began to fall． When I came back into house, it was raining harder and harder． I tried very hard to close the window． Then I heard a loudly crashing sound from the back of the house． When I ran out of my room to find out what had happened: a big tree had fallen down and broke the top of the backroom．