对违法使用明火作业或者在具有火灾、爆炸危险的场所违反禁令，吸烟、使用明火的，可处（）日以下拘留。（易）

A、十五

B、十

C、七

D、五

Although I've never worked for a bank before, I feel quite ______ there because I'm used to dealing with

figures. [ ]

A. at peace

B. at home

C. at sea

D. at will