阅读下面一则对话，在空白处填入适当的句子，使补全后的对话意思完整，结构合理，上下

问题：

阅读下面一则对话，在空白处填入适当的句子，使补全后的对话意思完整，结构合理，上下连贯。

每个空白处只能填写一个句子。

A: Hi! You look unhappy. (1) ____________________?

B: I got very bad news from the News Report. It happened in Jiangsu Province.

A: What was it?

B: A crazy man entered a kindergarten and wounded (杀伤) 31 persons, including kids and teachers.

A: (2)____________________. Something must be done to keep schools safer.

B: Right. (3) ____________________ when I grow up. Police can protect them from being hurt.

A: I think that's a good choice. (4) ____________________ if you want to be a policeman?

B: I am going to study harder and exercise every day to be stronger.

A: Oh, cool enough! I wish your dream come true.

B: Thank you.