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: Mollusks have one or ____ hearts.

SOLUTION: two

PROBLEM: Dogs are pack animals, and ____ dogs is the minimum number for proper socialization.

SOLUTION: five

PROBLEM: Reds can benefit from ____ to nine years' aging .

SOLUTION:
seven