根据对话内容填入合适的句子，使对话完整。
A: ______________________________?
B: Your alarm clock? Is it on the table?
A: _________________________.
B: Is it on the sofa?
A:_ ____________________.Thanks,mom.
B: Take it to your bedroom, please.
A:OK,mom._ _________________________?
B: Your keys ?They are on the desk.
A: Are these your books?
B: ________________ . They are your sister’s books.