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!Youlookunhappy.(1)____________________?

B:IgotverybadnewsfromtheNewsReport.IthappenedinJiangsuProvince.

A:Whatwasit?

B:Acrazymanenteredakindergartenandwounded(杀伤)31personsincludingkidsandteachers.

A:(2)____________________.Somethingmustbedonetokeepschoolssafer.

B:Right.(3)____________________whenIgrowup.Policecanprotectthemfrombeinghurt.

A:Ithinkthat'sagoodchoice.(4)____________________ifyouwanttobeapoliceman?

B:Iamgoingtostudyharderandexerciseeverydaytobestronger.

A:Ohcoolenough!Iwishyourdreamcometrue.

B:Thankyou.