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