Complete the sentences (1-5) with a) a, b) an, c) the, d) no article:

1.Trading … stock can be tricky if you've never
2.I want to sell … stock that I bought last week.
3.Oh, that's John. He's in charge of … accountin
4.We would like to set up a branch in … Russia. done it before. g department.
Foreign exchange markets are made up of only … bank​