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: Tetrads come in ____ shapes.

SOLUTION: seven

PROBLEM: All ticks have ____ pairs of legs during the immature stage and four pairs as an adult.

SOLUTION: three

PROBLEM: Threshold is a value to avoid ____ divide.

SOLUTION:
zero