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]: Natural ytterbium is a mixture of ____ stable isotopes, with seven other unstable isotopes known.
[A]: seven


[Q]: All matter exists in ____ dimensional space, both internal and external.
[A]: three


[Q]: Pork has ____ times as much thiamin as any other food.
[A]:
three