Make the sentences complete using on or off It is dark

Make the sentences complete using on or off It is dark in the room. Turn the light ... . It is cold in the room. The central heating is not ... . It is very hot here, turn the electric fire ... . In summer the central heating is usually ... in our houses. My little brother cant turn ... the light. He is very small. Early in the morning, when it is not dark outside we turn the light ... . Mike is doing his lessons. turn the television ..., please.