What country has ______ (old) city in the world?
the oldest
What's _____ (long) river in South America?
the longest
Which city has _______ (bad) traffic in the U.S.?
the worst
Which planet has ____ (short) year in our solar system?
the shortest
What's ____ (small) country in the world?
the smallest
What language has ____ (numerous) native speakers?
the most numerous
What is _______ (expensive) city?
the most expensive
What's ____ (dry) desert in the world?
the driest
What is ______ (big) city in North America?
the biggest
Where is ______ (large) soccer stadium in South America?
the largest
What's _____ (common) element in the universe?
the most common
Which country is ____ (good) producer of coffee?
the best
Where is _______ (old) subway system?
the oldest
Which country has ______ (pyramids) in the world?
the most pyramids
What's ______ (long) wall in the world?
the longest
What's ______ (cold) continent on Earth?
the coldest
What's _____ (tall) mountain in the world?
the tallest