Fromtheviewpointofwordformation,theword“smog”isa______.

Which of the following is NOT one of the characteristics of idioms?

From the viewpoint of word formation, the word “ smog” is a ______.

Idiomsnominalinnaturehavea(n)______asthekeywordineachandfunctionasanouninsentences.

To write up his novel, John is looking for an environment free ________ outside distraction.