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.

ATMs are expensive machines with an average useful life of ____ to fifteen years.
ten

Environmentalists warn that ____ turtle species are in severe decline from over-exploitation.
six

Eagles usually start to breed at four to ____ years of age.

nine