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: Traffic lights have ____ colors.

A: three
****
Q: China has about one in ____ of all smokers in the world.

A: four
****
Q: Most insects have ____ thoracic ganglia, each with connectives to muscles and sensilla.

A:
three
****