Соедините идиоматические выражения и их объяснения. 1.a hot potato. 2.to cost an arm and leg. 3.to think on one's feet. 4.to work like a charm 5.dead wood a.to work very well b.a very delicate matter c.people ot things that are no longer useful d.very expensive e.to adjust quickly to changer and make fast decisions