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

A: six
****
Q: Gibberellins are diterpenoids derived from four isoprenoid units forming a system of ____ rings.

A: four
****
Q: Most lunar months have two or ____ names.

A:
three
****