TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Woodchucks can dig up to _ entrances to one den.

SOLUTION: three

PROBLEM: Gravity is the weakest of all _ forces but unlike the others it has an unlimited range.

SOLUTION: four

PROBLEM: Molars have at least _ roots.

SOLUTION:
two