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: Mature birds boast a wing span of ____ feet.

SOLUTION: six

PROBLEM: Carbon is able to bond with up to ____ other elements.

SOLUTION: four

PROBLEM: Cleavage is very poor in ____ directions.

SOLUTION:
two