Ключевые слова: announcement, attention, audience, back, business, classroom, college, community, conference, congress, convention, corporate, day, education, enterprise, event, free, freedom, guest, hall, hearing, host, learning, lecture, listen, meeting, mic, microphone, people, podium, presentation, professional, public, school, seminar, show, sound, speak, speaker, speech, stage, student, studying, talk, teacher, teaching, town, university, voice, workshop,