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

SOLUTION: three

PROBLEM: Pertussis is highly contagious with symptoms that can linger ____ to ten weeks.

SOLUTION: six

PROBLEM: Procreation only occurs when ____ organisms are in adjacent spaces.

SOLUTION:
two