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.

Deer show ____ symptoms of the disease.
no

Atoms are extremely small, on the order of a few ____ billionths of a meter.
ten

Female cats can go into heat for the first time as early as ____ months of age.

five