a surprise test given without warning
неожиданный тест, проведенный без предупреждения (neozhidannyy test, provedenyy bez preduprezhdeniya)
"Our teacher gave us a pop quiz today."
"Наш учитель дал нам поп квиз сегодня." (Nash uchitel' dal nam **pop kviz** segodnya.)
to focus and work hard for a long time
to feel excited about something that is going to happen
to establish a rule or principle
in an uncertain or unstable situation
to take a short break
to reach the intended audience effectively
