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]: Some rusts produce up to ____ different spore forms.
[EX A]: five

[EX Q]: Some countries require passports to be valid for ____ months after expiry of the visa.
[EX A]: six

[EX Q]: Cytochrome oxidase consists of ____ cytochromes and two copper atoms.
[EX A]:
two