|What is the tallest mountain in the world?.
What is the longest river in the world?.
Which city is bigger, London or Seoul?.
What is the largest continent?.
Which river is longer, the Thames or the Mississippi?.
Which religion is the oldest, Christianity, Islam or Hinduism?.
Which is the fastest, a man, a horse or dog?.
Which is the smallest, a centimeter, an inch or a foot?.
Which is longer, a kilometer or a mile?.
Where is the longest wall in the world?.
This quiz has the following grammar adjectives - superlatives comparative - adjective comparative - superlative non of the above.