TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Urushiol oil can be active on any surface for _ years and possibly longer.

SOLUTION: five

PROBLEM: Forests have _ major functions.

SOLUTION: four

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

SOLUTION:
three