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: Traffic lights have ____ colors.

SOLUTION: three

PROBLEM: Every isometry is the composition of one, two, or ____ reflections .

SOLUTION: three

PROBLEM: Bacteria have ____ self-serving functions in working on organic remains.

SOLUTION:
two