The book is o_____ medicine It's ____{Lucy} class This is my ruler .his ruler is not an old.改错
问题描述：
The book is o_____ medicine It's ____{Lucy} class This is my ruler .his ruler is not an old.改错
答
The book is 【on】 medicine It's 【Lucy's】{Lucy} class
This is my ruler .His ruler is not old.H大写,去掉an