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.

[EX Q]: Tobacco companies account for ____ of the five biggest billboard advertisers in the country.
[EX A]: four

[EX Q]: Insects go through either three or ____ stages.
[EX A]: four

[EX Q]: Universe consists of ____ states.
[EX A]:
two