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.

Theobroma oil can exist in four different polymorphic forms of which only ____ is stable.
one

Pinks live only ____ years.
two

Artificial turf causes up to ____ times as many non-contact injuries as grass.

three