—Why does Mr Black look so sad this morning?

—I hear that a fire________in his house and lots of valuable things were burned last night.[ ]

A. broke into      

B. broke up

C. broke down  

D. broke out

紧急预备金额度通常为家庭月支出的（）为宜。

A.1～2倍

B.2～3倍

C.2～4倍

D.3～6倍