根据语境，填写适当的词语或句子补全对话。 A: Look at the man running down the street. Why do you think he is running? B: He could be running for exercise. A: No.  He might be running to _ 1 ___. He is wearing a suit. B: But there is no bus on this road.  Buses are not 2 to run here. A: Oh! Maybe he is going to be late and running to work. B: I don't think so.  He _ 3 __ scared. A: Yes.  You are right.  Look! What's that in the sky? B: It _ 4 __ a UFO.  And it's landing. A: Look at that woman with a camera. B: She must be a reporter from the TV news. A: No.  Look at those other people.  They are actors.  Oh, I see. 5      .