Mr. Smith, together with his wife, ______ coming soon. [ ]

A. are

B. is

C. were

D. does

警察甲与乙开玩笑，随手拿起执勤时放在桌上的手枪向乙瞄准、开枪，并同时戏称“我一枪打死你”，不料枪中有子弹，乙被当场打死，甲的行为是

A．故意犯罪行为

B．意外事故

C．疏忽大意的过失

D．过于自信的过失