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]: Respiratory therapists complete two to ____ years of education.
[A]: four

[Q]: Many people have ____ symptoms until they suffer chest pains or a heart attack.
[A]: no

[Q]: Corporations have ____ laws that control their morality or ethics.
[A]:
no