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]: Ozone leaves ____ by-products except pure oxygen.
[A]: no


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


[Q]: China is home to ____ out of every five people on earth.
[A]:
one