题目内容：
根据下面资料，回答题 提示：一位警察阻止了一位将要过马路的老人。警察告诫老人在红灯亮起之前不要
移动位置，否则会很危险。老人接受了警察的建议并继续等待。
Policeman: Excuse me, ma'am, you can't cross the road there. It's dangerous.
Elderly woman: What? 51
Policeman: You mustn't cross the road there! Too many cars are coming and going. Elderly woman : 52
Policeman: Stay where you are. If you turn back, you'll be in danger, too.
Elderly woman: All right.
Policeman : Don't move ! Look ! 53
Elderly woman: Good heavens! How long shall I stay here?
Policeman: 54 I'll come to help you soon. Don't worry.
Elderly woman: But there is no end to the stream of cars.
Policeman: Wait till the red lights are on again.
Elderly woman: 55
第（51）题
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：