Word formation - 1. Key

1 action, activity, inactive, actress / 2 additives, addition / 3 admirable, admiration / 4 disadvantage, advantageous / 5 advertising, advertisement / 6 disagree, agreement / 7 attractions, attractively / 8 basic, basis / 9 calculations, calculator, calculating / 10 collecting, collectors, collection / 11 comparison, comparatively, comparable / 12 competitors, competitive, competition / 13 confirmation, unconfirmed / 14 continuation, discontinued, continually, continuous