People _______ watch TV in the past., used to, didn't use to, 50 years ago, my grandfather _______ write letters to his friends., used to, didn't use to, They _______ have smartphones when they were young., didn't use to, used to , People _______ use candles for lights before electricity., didn't use to, used to, 300 years ago they __________ travel by camel; now they drive cars., used to, didn't use to, Children __________ have online classes in the past., used to, didn't use to.

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