Who invented the electric light bulb?, Alexander Graham Bell, Thomas Edison, The Wright brothers, Tim Berners-Lee, What invention helps people travel on the road?, the train , the ship, the car, the airplane, Which invention helps people keep food cold and fresh?, the oven, the washing machine, the refrigerator, the microwave, What invention helps people watch movies and shows at home?, the radio, the television, the camera, the computer, 5. Which invention helps people write and calculate easily?, the typewriter, the computer, the clock, the printer.
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