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.

Box turtles are mature and capable of mating at ____ years old.
five

Some people routinely sleep only ____ hours a night but feel fine during the day.
four

Women are ____ times more likely to have migraine headaches than men.

three