一、1 - 5 A B A B A
二、1、schoolbag , pencil case. dictionary , pencils , erasers , books
2、略
三、1 - 5 C A B B C
四、1、pen , it is , mine
2、ruler , it isn't , It's. ruler
3、pencil boxes/pencil cases, they are,his
4、Excuse me , Are , dictionaries , they aren't , his , Thank you
五、1、my , mine
2、your
3、his
4、Hers
5、his