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.

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

A: five
****
Q: Birds have ____ basic types of feathers.

A: three
****
Q: Ovarian cancer has ____ symptoms in the early stages.

A:
no
****