countable and uncountable nouns- many, much

How (a)   pizza left?

How (a)   bottles of milk left?

I have (a)   books in my room.

We have (a)   lessons to revise.

Kelly doesn't have (a)   money in her wallet.

I don't have (a)   time to clean my room.

You can see (a)   apples on the tree.

There isn't (a)   coffee in the jar.

There aren't (a)   potatoes left in the refrigerator.

Gavin has (a)   toys at home.