(1)Tobeginwith,______________mightberesponsibleforthissocialphenomenon.
(2)Firstandforemost,thisproblemstems/resultsfrom________,whichtendstobeinevitable/unavoidable.
(3)Inthefirstplace,thisphenomenoncouldbeattributedto________,whichmajorityofthepopulationfailstotakeintoconsideration.
(4)Foronething,thissituationcouldbeseen/considered/regarded/deemedasaresult/consequenceof________.
(5)Perhaps,thisprimaryreasonisthat____________________(句子)