1)History is the study of______ of human-kind . Through history , we can learn how _____ have developed different ________ , _______ , social and ______ system that ______ our lives in the present day .
2) Historical concept
History has two important concept.They are _________ and ___________ . the former describes something like tradition , _________ or the ___________ that have not change with time passing.The latter is the _____ of continuity .