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: Presidential elections take place every ____ years.

Answer: four


Question: People often have to wait between three and ____ years for an organ especially for a liver.

Answer: five


Question: Foods are of ____ types, acid or alkaline.

Answer:
two