until, Electric lightbulbs weren't used _________ the late nineteenth century., for, Gas was used to light homes ______a hundred years., century, Chocolate milk was sold as medicine in the eighteenth ___________., Each, _______ day, 27,000 trees are used to make toilet paper., Nowadays,  __________ no one uses the small pocket in jeans but they were originally designed for pocket watches., These, days, more chocolate is eaten in Switzerland than in any other country., ago, The first iPhone was made more than ten years_______., Until, _______ the 1990s, most people listened to music on CDs..

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