All the lights in the classroom ____before you leave

All the lights in the classroom ____before you leave The lights must___before you leave the classroom ( )you turn off all the lights when you leave the classroom. Jane,please turnoff the lights-----you leave the classroom. _________turn off the lights before you leave the classroom? remember（ ）the lights when you leave the classroom Before you leave the classroom,please ________the lights． when you leave ,please t____o____.the lights in the classroo Please ( )the lights when you leave the classroom.为什么用turn o Be sure ( ) off the lights when you leave the classroom.括号里为 don't forget to __the lights before you leave the classroom. When you leave,please turn off_____.A.all the lights B.the a