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]: Romantic love involves ____ people.
[A]: two


[Q]: Photosynthesis has ____ main sets of reactions.
[A]: two


[Q]: Cedar Creek has a series of ____ small millponds and dams.
[A]:
five