A kangaroo, a horse, a cheetah - which of these animals is the fastest?
English, French, Chinese - which of these languages is the most widely spoken?
The Nile, the Volga, the Mississippi - which of these rivers is the longest?
The Arctic Ocean, the Atlantic Ocean, the Pacific Ocean - which of these oceans is the biggest?
The Tower of London, St Paul's Cathedral, the National Gallery - which of these attractions is the oldest?