The words are arbiter, vacuous, burgeon, commensurate, vagary, secularAs the terrorist threat _1_ each year in the United States,citizens must raise their vigilance to _2_ levels?

The words are arbiter, vacuous, burgeon, commensurate, vagary, secular As the terrorist threat _1_ each year in the United States, citizens must raise their vigilance to _2_ levels. Citizens must also hinder terrorist intelligence - gathering capabilities by implementing small irregularities in their day - to - day routines. This intentional _3_ will prevent terrorists from determining the best time to attack. We must learn to vary concentrations of people, control the distribution of work schedules, and otherwise keep terrorists as _4_ as possible about our daily routines.