In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Willow flycatchers have a lifespan of _ to four years.

A: three
****
Q: Ozone leaves _ by-products except pure oxygen.

A: no
****
Q: Malnutrition affects _ times more children under four in the countryside than in the towns.

A:
three
****