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 prisons house up to ____ times their capacity.

SOLUTION: seven

PROBLEM: Allergic rhinitis is the most common allergic disease, with one in ____ Canadian adults affected.

SOLUTION: five

PROBLEM: Toxic pollutants come from ____ main sources, agriculture and industry.

SOLUTION:
two