TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Essential oils have a non-toxic, residual effect of up to five months from just _ application.

SOLUTION: one

PROBLEM: Education wastes about _ thirds of the talent of society.

SOLUTION: two

PROBLEM: Alcohol is high in calories - it supplies _ calories per gram and no nutrients worth mentioning.

SOLUTION:
seven