Пожалуйста, помогите найти лишние слова в этих рядах!

1) achieved, advanced, active, devoted, developed
2) applicant, student, assistant, important, receptionist
3) compulsory, graduated, optional, appropriate, necessary
4) last, liberate, learn, fast, laugh
5) supply, study, research, examine, learn
6) set, subject, group, collection, team