TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Humans begin laughing at _ to three months of age.

SOLUTION: two

PROBLEM: Titanium is found in column _ along with chemically similar zirconium, hafnium, and thorium.

SOLUTION: four

PROBLEM: Caterpillars shed their skins four or _ times as they grow, in a process called molting.

SOLUTION:
five