补全对话。
根据对话内容及上下文，在空白处填入适当的词，使对话意思完整。每空一词。
Lucy: Mum, can you see my pencil?
Mother: No, I can’t . What is that on the desk?
Lucy: Let me see . It’s my pen.
Mother:        is your pencil-box?
Lucy: Oh, my pencil-box is in my bag.
Mother: Where is your bag?
Lucy: I can’t see.
Mother: Is it on your desk?
Lucy: No, it     .
Mother: Look! Lucy. It’s over there.
Lucy: Where?
Mother: Behind the door.
Lucy: Oh, it’s here. I can_         it.
Mother:         your pencil in your pencil-box?
Lucy: Yes, it is.
Mother: Lucy, you must look        your things.
Lucy: Thank you very much, Mum.