You should the lights if there is no one in the room.A. turn outB. turn offC. go backD. g

问题补充：

You should the lights if there is no one in the room.

A. turn out

B. turn off

C. go back

D. go on

答案：

A. turn out

(答案→)B. turn off

C. go back

D. go on

解析：turn off意为：关（电灯、收音机）等。