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]: China has about one in ____ of all smokers in the world.
[A]: four


[Q]: Martial arts are multi-sensory, combining all ____ modalities in classes.
[A]: three


[Q]: Flat screens come in ____ varieties, analog and digital.
[A]:
two