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: Sponges are subdivided into ____ classes.

SOLUTION: three

PROBLEM: Primates have ____ digits on their forelimbs.

SOLUTION: five

PROBLEM: Lip tattoos wear well for approximately four to ____ years and fade over time.

SOLUTION:
five