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]: Infertility affects one in ____ couples today.
[A]: five


[Q]: R is an average of the color rendering ability of ____ or more specific colors.
[A]: eight


[Q]: Some plants have ____ or four tunnels per stalk.
[A]:
three