--Herry,----the light is----when you leave the lab --All right A be sure;turned on

问题描述:

--Herry,----the light is----when you leave the lab --All right A be sure;turned on
B make sure;turned off C sure;turning off
D make sure;turning off

选B
句子是祈使句,结构是do sth.,所以第一个空be sure 和make sure 都不错.
第二个空的话,从意思上讲是关灯(turn off),而且要用被动(灯被关掉),被动结构是be+done,所以的turnedoff .