1, Headphones: Before headphones, people used to ..., 2, Traffic Lights: Before traffic lights, drivers used to..., 3, The Internet: In the past, students used to..., 4, Umbrellas: Before umbrellas, people used to..., 5, Matches / Lighters: Long ago, people used to..., 6, Wheeled Luggage: Travelers used to..., 7, Headphones: Since headphones were invented, listening to music (verb in present perfect +complement)..., 8, Traffic Lights: Traffic lights (verb in present perfect +complement)..., 9, The Internet: The internet (verb in present perfect +complement)..., 10, Wheeled Luggage: Suitcases with wheels (verb in present perfect +complement)..., 11, Umbrellas: Umbrellas (verb in present perfect +complement)..., 12, Matches / Lighters: Lighters (verb in present perfect +complement)...
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Inventions
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