Ключевые слова: answer, background, blackboard, blue, board, box, business, businessman, chalk, chalkboard, check, checkbox, checklist, choice, choose, concept, draw, education, exam, examination, fill, form, hand, human, idea, list, man, mark, no, option, person, pointing, presentation, questionnaire, report, school, select, showing, sign, solution, survey, teacher, teaching, test, tick, white, work, write, yes,