Lexicalmanipulationisoneaspectoftherhetoricalfeaturesofidioms.ThefollowingEXCEPT______belongtolexicalmanipulation.
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.
Hetalkedalotaboutthingsandpersons________theyrememberedintheschool.
RobertFrostisgenerallyconsideredaregionalpoetwhosesubjectmattersmainlyfocusonthelandscapeandpeoplein().