A．wayB．processC．procedureD．action

【C8】A．wayB．methodC．techniqueD．habit

【C13】A．practiceB．processC．procedureD．program

A．wayB．formC．sortD．type

【C7】A．wayB．subjectC．thingD．manner

【C17】A．phenomenonB．processC．modeD．pattern

The actual______by which coal is extracted is well worth seeing.A．conductB．processC．proced