To fill in the blanks properly, we can use "are" for plural nouns and "is" for singular nouns. Here's the completed version:
There are some meat.
There aren't any onions.
There is some cheese.
There aren't any pasta.
There is some yoghurt.
There is some milk.
There are some oranges.
There are some sausages.
There is some fish.
(Note: "meat" is uncountable, so "are" is used with a plural noun phrase and is often expressed as "some meat." Similarly, "cheese," "yoghurt," and "milk" are also uncountable.)