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: Niobium occurs primarily in ____ minerals, columbite and pyrochlore.

SOLUTION: two

PROBLEM: Cellulose contains nothing that is considered hazardous, and carries ____ hazardous warning messages.

SOLUTION: no

PROBLEM: Women live longer than men by an average of ____ years.

SOLUTION:
seven