Rule reminder
'Importante' = important (general, all-purpose). 'Rilevante' = relevant/noteworthy (formal; implies something deserving attention — often in statistics, law, journalism). 'Significativo' = significant/meaningful (implies bearing meaning or measurable impact — statistics, changes, gestures). 'Cruciale' = crucial (implies a decisive turning point — high stakes). 'Fondamentale' = fundamental/essential (implies something at the very foundation — cannot be removed).
È _____ che tutti i passeggeri abbiano la cintura allacciata.