TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Rheas are brownish instead of black like the ostrich and have _ toes instead of two.

SOLUTION: three

PROBLEM: Metals often crystallize in a _ dimensional version of the hexagonal closest packed structure.

SOLUTION: three

PROBLEM: Meat can stay in the warmth of the intestine for at least _ days until it is digested.

SOLUTION:
four