TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Some school boards have _ teacher-librarians at all.

SOLUTION: no

PROBLEM: Liquids usually descend in three to five seconds, and solids in _ to twenty seconds.

SOLUTION: eight

PROBLEM: Humans stand upright and walk on _ legs.

SOLUTION:
two