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]: Electric power means no gas or oil to spill, and ____ pollution in the air.
[A]: no

[Q]: Parallel coordinates use ____ or more parallel axes.
[A]: two

[Q]: Ozone is actually ____ oxygen atoms bonded together.
[A]:
three