11. activist - n. one who seeks change through action
12. actor - n. someone acting in a play or show
13. add - v. to put (something) with another to make it larger; to say more
14. administration - n. the executive part of a government, usually headed by a president or prime minister
15. admit - v. to accept ("admitted to the United Nations"); to express one's guilt or responsibility ("He admitted that what he did was wrong.")
16. adult - n. a grown person
17. advertise - v. to show or present the qualities of a product to increase sales
18. advise - v. to help with information, knowledge or ideas in making a decision
19. affect - v. to produce an effect on; to influence ("A lack of sleep affected the singer's performance.")
20. afraid - ad. feeling fear