Humans ______ (live) in small hunter-gatherer societies., used / used to use, Early humans ______ (use) simple stone tools., lived / used to live, People ______ (rely) on hunting and gathering for survival., relied / used to rely, Humans ______ (cook) food over fire., cooked / used to cook, Early humans ______ (bury) their dead., buried / used to bury, Different human species ______ (exist) at the same time., existed / used to exist, People ______ (communicate) in a proto-language., communicated / used to communicate, Humans ______ (cooperate) in small tribes., cooperated / used to cooperate, Our ancestors ______ (memorize) large amounts of information about plants and animals., memorized / used to memorize, Humans ______ (travel) in small groups., traveled / used to travel, People ______ (make) tools by hand., made / used to make, Humans ______ (survive) without modern technology., survived / used to survive, Communities ______ (build) early defence structures., built / used to build, People ______ (exchange) knowledge face to face., exchanged / used to exchange, Humans ______ (depend) on agriculture and livestock., depended / used to depend, Villages ______ (grow) into cities and kingdoms., grew / used to grow, Scientists ______ (know) much less about the universe., knew / used to know, People ______ (live) without computers or the Internet., lived / used to live, Humans ______ (store) information in books and memory instead of digitally., stored / used to store, People ______ (spend) more time on physical survival tasks., spent / used to spend

USED TO

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