Before the invention of the _______ people used to light places with candles and oil lamps
light bulb
Before the invention of the _____ people used to use a scrub board and a laundry sink
washing machine
Before the invention of the _______ people used to put salt on the food to preserve it
refrigerator
Before the invention of the ______ people used to ride horses to travel to places
car
Before the invention of the _____ people used to use a hand held fan to cool down
Fan/air conditionar
Before the invention of the _______ people used to use public phones
mobile phone/ cell-phone
Before the invention of the ______ people used to listen to lots of radio shows
television
Before the invention of the ______ people used to copy books by hand
printed book
Before the invention of the _______ people used to write letters and mail them
internet