短文改错It was quiet late at night. I was reading a newspaper in

更正在括号中标明!
It was【quite】late at night.I was reading a newspaper in my room when I 【heard】 someone knocking on the door.I opended it and saw a young man with 【glasses】 standing there.He said that he was a firend of my 【sister's】 and wanted to have a talk with her.I wondered 【if/whether】 my sister had such a friend but 【I】had to let him in.
As he talked,I found that he knew nothing 【about】my sister.Then I came to know that his words were【not】true.Suddenly my sister rushed in and the young man was so surprised 【that】he didn't knew what to do for a moment.I caught the man by the arm at once while my sister sent for a policeman.

1.正确
2.hear改成heard（时态是一般过去时）
3.glass改成glasses（眼镜是复数）
4.sister改成sister's（所有格）
5.把that改成whether（考查wonder的用法）
6.but had to ---but I had to （but分句缺少主语，加I)
7.knew nothing my sister-...

a young man with glass---a young man with glasses;
a firend of my sister---a firend of my sister's;
and wanted to have a talk with her---and that he wanted to have a talk with her;
I wonde...