Fill in the blanks with "some", "any", "a" or "an". B: Sorry, there isn't
coffee left. Would you like
cup of tea?​

Sorry, there isn't any coffee left. Would you like a cup of tea?​

any так как неисчесляемое в отрицании

а так как неопределённый предмет в единственном числе

-Sorry, there isn't  any coffee left. Would you like a  cup of tea?​