Ben和Kelly正在寻找照相机的失主.

Ben:A camera._Whose_____________________________is it?
Kelly:Let's ask.
Ben:Excuse me._Is this camera yours_______________________________?
P1:NO,it isn't.
Kelly:__Excuse me_____________________.Is this your camera?
P2:__No it isn't________________________.
Ben:Don't worry.
Kelly:_What do we do then_________________________________?
Ben:Maybe we can_give it to the security guard_______________________.