some/any/a

There is .... armchair in the room.

There are .... armchairs in the room.

Are there .... cushions in the room?

Is there .... TV in the room?

There isn't.... desk in the room?

There aren't .... curtains in the room?

This .... a fridge.

These .... some books.

That ... some money.

Those .... some flowers.

There are .... posters on the walls.

There aren't .... windows in the room?