помогите пожалуйста вставить предлоги в предложения( английский)

Question

1.Serving as medium __ exchange is presumed to have been an essential function ___money ___ centuries. 
2. ___ barter, goods are traded directly or swapped ___ other goods. 
3.___ Britain prices are quoted ___ pounds sterling. 
4. ___ the rapid German inflation ___ 1922-23 prices were quoted in dollars and payments were made ___ marks ___ the same time.

Жанна Ямбаева · Accepted Answer

1.Serving as medium FOR exchange is presumed to have been an essential function OF money FOR centuries. 
2. FOR barter, goods are traded directly or swapped TO other goods. 
3.IN Britain prices are quoted IN pounds sterling. 
4. DURING the rapid German inflation IN 1922-23 prices were quoted in dollars and payments were made IN marks AT the same time.