Read the dialogue and choose the correct answer.

Lucy: How about making a/ an apple pie?

Alan: Great idea! Have we got some/ any apples?

Lucy: Yes, there are some/ any in the bowl. How much/ many do we need?

Alan: A lot, about a kilo/ litre.

Lucy: We haven’t got enough. We can buy some/ any in the corner shop.

Alan: And we need some/ any flour, too. Look at the recipe. How much/ many flour do we need?

Lucy: About half a pound. And we need three knives/ spoons of sour cream so let’s buy a small tub/ bag, too.

Alan: And how much/ many eggs do we need?

Sue: Four. And we also need some/ any butter and some/ any sugar. Oh, we haven’t got some/ any butter.

Andy: We can buy a bar/ tin of butter in the shop, too.

He decided (study) _______ biology.