Ben：A camera.whose is it?
kelly：Let’s ask.
Ben：Excuse me.----is this your camera--------------------------------?
p1：No,it isn’t.
kelly：----excuse me ----------------.Is this your camera?
p2：-------no,it isn't-----------.
Ben：Don’t worry.
kelly：---------why-----------?
Ben：Maybe we can----put it in the lost and found case------------
不一定对,答案要首字母大写.,反正意思是绝对没有错.