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.

Acupuncture needles are about two to ____ inches long.
three

Prions are protein molecules which have ____ metastable states.
two

Cats There are thirty ____ recognised species of cats and a whole host of subspecies or races.

five