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: Manatees swim ____ to six miles per hour.

SOLUTION: two

PROBLEM: Sexual maturity occurs at ____ to four years for females and four to five years for males.

SOLUTION: three

PROBLEM: Malnutrition affects three times more children under ____ in the countryside than in the towns.

SOLUTION:
four