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: Blisters normally burst and crust over within three to ____ days.

SOLUTION: five

PROBLEM: Owls have ____ toes on each foot, like most birds.

SOLUTION: four

PROBLEM: Marriage is a joining of ____ hearts.

SOLUTION:
two