どの => which N5
いつかの ... => Previously N4
Time
たぶん => Maybe... N4
Speculation
ぶり => style; manner; way​ N1
たぶん => perhaps; probably N4
どうせ (のこと) だから => Because eventually have to ... N3
Invite and advise
べつだんの => particular; special N2
Description
どうも => Confused, bewildered N3
Emphasize
どうも => Not sure... N3
Vague
どのくらい => how long N5
など~ものか => No way... N3
Position, perspective
どうやって => how N5