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: Airplanes still fly four to ____ times faster than zeppelins.

SOLUTION: five

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

SOLUTION: six

PROBLEM: Many starfish have ____ arms, but there are some deep-water species that carry more than fifty.

SOLUTION:
five