TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Falcons are roughly divisible into three or _ groups.

SOLUTION: four

PROBLEM: Woodchucks can dig up to _ entrances to one den.

SOLUTION: three

PROBLEM: Fever usually lasts for an average of _ days in adults.

SOLUTION:
three