TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Armaments manufacturers use lithium to produce tritium in _ ways.

SOLUTION: two

PROBLEM: Transitional milk is secreted between about four days and _ days postpartum.

SOLUTION: ten

PROBLEM: Iron comes in _ forms, hard and soft.

SOLUTION:
two