Ключевые слова: answer, art, background, business, check, checkbox, checklist, choice, clipboard, color, colorful, concept, contour, design, document, education, exam, examination, flat, form, gradient, icon, illustration, isolated, line, linear, lineart, list, mark, note, office, outline, page, paper, pencil, question, questionnaire, quiz, random, report, result, school, sheet, sign, success, survey, symbol, test, tick,