instruction:
Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.
question:
Blood donors can give blood every ____ weeks, or six times a year.
answer:
eight


question:
Acupuncture needles are about two to ____ inches long.
answer:
three


question:
Water is the only substance on earth that exists naturally in ____ states .
answer:

three