Theword“minister”originallymeant“aservant”,butnowhaschangedto“aheadofaministry”.Thisprocessofmeaningchangeiscalled______.

Fromtheviewpointofwordformation,theword“smog”isa______.

Young________hewas,hemanagedtomakealivingonhisown.

WhenyouwereinLondon,didyouvisit________________Tower,too?

EmpiricalstudiesshowthattheprocessofSLAisaprocessofconstructingandmodifyingrulesofcommunication.