看图完成对话，每空一词。

A: Hi, Liu Tao. What are these _______ your desk?
B:  __________ are some books  and two lights(台灯)
A: What’s __________ your desk?
B: There ________ some boxes.
A: _________ ________ boxes are there?
B:There are three.

科目 英语   题型 选择题   难度 较易

知识点： 介词的辨析