Choose the right grammatical form in each gap to complete the text

Sam and I are going to the shop on the corner of Park Road. It's called Mary's Grocery. Sam wants to know if they sell [a|an|any|some] milk. He likes it very much. I don't want [some|any|a|an] milk, but maybe I'll buy [some|any|a|an] orange juice. The shop isn't very big, so there aren't many things to buy. They sell [a|an|any|some] food and drinks, bread, eggs, sausages, some fruit and vegetables, orange juice and milk. Yes, they've got milk, and Sam is very happy about that. Now he has [a|an|any|some] carton of his favourite drink. And I've bought [a|an|any|some] orange instead of orange juice. Yummy!