问题标题：
Adultssmilelessthanchildrendoinaday.386timesless,infact.Asaresult,wearebecomingmoreandmoreunhappyandu_______(76).Allhumanbeingsareb_______(77)knowinghowtosmile.Childrenares_______(78)tosmileupto400timesaday.Forthem,asmil
问题描述：
Adultssmilelessthanchildrendoinaday.386timesless,infact.Asaresult,wearebecomingmoreandmoreunhappyandu_______(76).Allhumanbeingsareb_______(77)knowinghowtosmile.Childrenares_______(78)tosmileupto400timesaday.Forthem,asmilecomesfromtheirh_______(79)andpleasure.Unluckily,aswegrowo_______(80),wesmilelessandless.“Adultsonlysmile14timesaday,”saysJamb,aresearcher.Thatmeanstheyonlysmile
任小晶回答：
76.unpleasant
77.born
78.sure
79.happinness
80.older
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