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.

[Q]: Statistics show that one out of every ____ people has a mental illness.
[A]: four


[Q]: Presidential elections take place every ____ years.
[A]: four


[Q]: Some people experience ____ symptoms during a heart attack.
[A]:
no