Tell whether these are countries, cities, continents or neither: Australia, Mexico, Mexico city, Antartica, Singapore, India, Gulf, Beijing, Jakarta, Luxembourg, Vatican City

Australia is a country as well as a continent.
Mexico is a country.
Mexico City is a city.
Antarctica is a continent.
Singapore is a country as well as a city.
India is a country.
Gulf is neither.
Beijing is a city.
Jakarta is a city.
Luxembourg is a country as well as a city.
Vatican City is a country as well as a city.