The manager lost his ________ just because his secretary was ten minutes late.

A.mood

B.temper

C.mind

D.passion

答案及解析： B

解析：

“仅仅因为秘书迟到了10分钟，经理就发脾气了”．temper“脾气、情绪”，lose one's temper意为“发脾气、生气”．