Can you find the missing words?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Fill in the missing words.

1. The Nile is the longest in the world.
2. Switzerland is one of the richest in the world.
3. Cheetahs are the fastest we can find.
4. The blue is the heaviest animal in the world.
5. Antarctica is one of the coldest places on .
6. Mirror, mirror on the , who's the prettiest of them all?