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: All birds have ____ legs with four toes each.

SOLUTION: two

PROBLEM: Carpenter ants can easily drop to a structure from tree limbs as high as ____ feet above the roof.

SOLUTION: five

PROBLEM: Fire occurs any time ____ elements are present - fuel, heat, oxygen and the chemical chain reaction.

SOLUTION:
four