TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Sewage travels through _ different sets of pipes.

SOLUTION: three

PROBLEM: Roundworms are fairly large worms that can grow to be _ or five inches long.

SOLUTION: four

PROBLEM: Ostrichs only have two toes, and _ toenail.

SOLUTION:
one