用方框中所给单词的适当形式填空，每个单词限用一次。

be,  room,  think,  they,   grandparents

 
Miss Lee        Anna is a nice girl.
My           bedroom is very clean and tidy.
---Are these your notebooks?   ---No, they’re          notebooks.
They are my sister’s and my mother’s         .
On the desk        my clock and some books.