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: Some airports have ____ parallel runways.

SOLUTION: two

PROBLEM: Most people get one or ____ common colds every year.

SOLUTION: two

PROBLEM: Otters mature sexually by ____ years of age.

SOLUTION:
two