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]: Neutrinos are particles with almost ____ mass and no electric charge.
[EX A]: no

[EX Q]: Babies crawl into a pouch on the mother's belly and stay there ____ months.
[EX A]: four

[EX Q]: Paradox is a situation where ____ opposites seem to coexist.
[EX A]:
two