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]: Bond angles The bond angle defined by ____ atoms is calculated.
[A]: three


[Q]: Marriage is the legal union of ____ people.
[A]: two


[Q]: Neutrinos do exist, in huge numbers, but all known neutrinos have ____ mass.
[A]:
zero