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.

[EX Q]: Coastal kelp beds, for example, appear to be three times larger than in the past four or ____ years.
[EX A]: five

[EX Q]: All grays have ____ saturation.
[EX A]: zero

[EX Q]: Steroids are compounds that have ____ rings fused together in a specific way.
[EX A]:
four