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]: All birds have ____ legs with four toes each.
[A]: two


[Q]: Gravity there is ____ times that of Earth.
[A]:
ten