Which of the following are cities in Australia: Sydney, Melbourne, Adelaide, Perth, Canberra, Rio de Janeiro, Beijing, Shanghai, New York, Singapore, Germany, United States, Tokyo
Cities in Australia include Sydney, Melbourne, Adelaide, Perth, Canberra.

However Rio de Janeiro is not in Australia, but in Brazil.
Beijing, Shanghai are not in Australia as well, there are in China.
Singapore, Germany, United States are not cities, they are countries. Even Singapore is both a country and its only city.
New York is in United States.
And Tokyo is in Japan.