--- Liu Tao has never read the book The Adventure of Tom Sawyer , _________ he?--- _________. He told me it's very interesting. He'd like to read it again.
___ some milk in the glass.
---___ he ___ his lessons? ---No, he isn’t.
Is there ____ “X” in the word “box”?
There ____ a book and a pen on the desk.
The cup is on _____ desk.