Not leave / fridge door / open / cold air / escape / use / lot / electricity.

A. Don't leave the fridge door open because cold air escapes, and this uses a lot of electricity.

B. Don't leave the fridge door open so cold air escapes, and this uses a lot of electricity.

C. Don't leave the fridge door open although cold air escapes, and this uses a lot of electricity.

D. Don't leave the fridge door open however cold air escapes, and this uses a lot of electricity.

E7- GS- Unit 10- Practice (4)