修改一篇英文文章中的语法错误。
“请修改下述文章中的语法错误并返回修改后的文章。The boy was sitting in it’s room when he heard a loud noise outside.”
Here is the corrected sentence: "The boy was sitting in his room when he heard a loud noise outside." Note that "it's" is a contraction of "it is" or "it has," while "its" is the possessive form of "it", so "its" is not appropriate in this context.