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: Tobacco companies account for ____ of the five biggest billboard advertisers in the country.

SOLUTION: four

PROBLEM: Tuberculosis develops in ____ stages.

SOLUTION: two

PROBLEM: Cows normally expel the placenta within ____ to eight hours.

SOLUTION:
two