---Try to remember to turn off the light when you leave the room. ---I’m trying to expense

问题补充：

---Try to remember to turn off the light when you leave the room.

---I’m trying to expenses.

A. keep off

B. keep down

C. keep out

D. keep from

答案：

A. keep off

(答案→)B. keep down

C. keep out

D. keep from

解析：本题的含义是在你离开房间的时候要记住关灯，我会努力地控制开支费用的。Keep down表示控制的意思，故本题选B。