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: Amphibians are the first true vertebrates with ____ limbs.

SOLUTION: four

PROBLEM: Most people stay three or four years, sometimes five or ____ years.

SOLUTION: six

PROBLEM: Browsers are generally of ____ kinds, text-based and graphical.

SOLUTION:
two