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]: Acupuncture needles are about two to ____ inches long.
[EX A]: three

[EX Q]: Cichlids are popular in the aquarium hobby for a ____ reason.
[EX A]: four

[EX Q]: Rabbits are diphyodont, having ____ recognizable sets of teeth.
[EX A]:
two