TASK DEFINITION: Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.
PROBLEM: Ferrets normally tremble for ____ reasons.

SOLUTION: two

PROBLEM: All orthodontists are dentists, but only about ____ percent of dentists are orthodontists.

SOLUTION: six

PROBLEM: Ammonia is among the ____ most abundantly produced chemicals in the world.

SOLUTION:
five