instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Normal adults appear to require _ to eight hours of sleep per day on average.
answer:
six


question:
Cleavage is imperfect in _ directions, prismatically.
answer:
two


question:
Hard cheese is defined as any cheese which is over _ months old.
answer:

six