TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Frozen grafts can have a shelf life of up to _ years.

SOLUTION: five

PROBLEM: Smokeless tobacco is used in _ common forms.

SOLUTION: two

PROBLEM: Synchronized stimuli overloads four of the _ senses at the same time.

SOLUTION:
five