问题描述：
ChangbaishanisChina'slargestnaturereserveandit 61 (keep)initsnaturalstateforthepeopleofChinaandvisitorsfromallovertheworld 62 (enjoy).Thelandvariesinheight 63 700metresabovesealeveltoover2000metresandishometoagreat 64 (diverse)ofrareplantsandanimals.Amongtherareanimalsarecranesblackbearsleopardsandtigers.ManypeoplecometoChangbaishantostudyitsuniqueplantsandanimals.
65 cometowalkinthemountainstoseethespectacularwaterfallsortobatheinthehotwaterpools.Howevertheattraction 66 arousesthegreatestappreciationinthereserveisTianchiortheLakeofHeaven.
Therearemanystories 67 (tell)aboutTianchi.Themostwell-knownconcernsthreeyoungwomenfromheaven.TheywerebathinginTianchi 68 abirdflewabovethemanddroppedasmallfruitontothedressoftheyoungestgirl.Whenshepickedupthefruittosmellititflewintohermouth. 69 (swallow)thefruitthegirlbecamepregnantandlatergavebirthtoahandsomeboy.Itissaidthatthisboywhohadagreatgiftforlanguagesand
70 (persuade)isthefatheroftheManchupeople.