Please turn __________ the light before you leave.
A. on                     B. off                 C. down

 Please turn __________ the light before you leave.

A. on                     B. off                 C. down

The room is dark．Please turn ________ the light．

1. A.
   on
2. B.
   off
3. C.
   up
4. D.
   down

Please turn _______ the light before you leave.

                   A. on                       B. off                        C. up                          D. down