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]: International trade is a ____ way street.
[A]: two


[Q]: Some people routinely sleep only ____ hours a night but feel fine during the day.
[A]: four


[Q]: Friction is divided into ____ categories, static and kinetic.
[A]:
two