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]: Wind is renewable, and produces ____ emissions or by-products.
[EX A]: no

[EX Q]: Clovers occasionally have leaves with ____ leaves, instead of the usual three.
[EX A]: four

[EX Q]: Crystal growth is affected by ____ naturally occurring factors.
[EX A]:
four