A:Hey,Mike!Look at the man running down the street.(51)___
B:He could be running for exercise.
A:No.(52)___ He's wearing a suit.
B:But there is no bus on the road.Buses are not allowed to run here.
A:oh!So maybe he's going to be late and running to work.
B:I don't think so!He looks scared.
A:yeah,look!(53)___.
B:It must be a UFO,And it is landing.
A:Look at the lady with a camera.
B:(54)___.
A:No look at those other people.They are actors,Oh,I see(55)___