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: Ozone is formed of ____ atoms of oxygen.

SOLUTION: three

PROBLEM: Rattlesnakes breed only every ____ to three years.

SOLUTION: two

PROBLEM: Perennials live more than ____ years.

SOLUTION:
two