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.

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

Merlin is about five and ____ half inches long.
one

Some girls bleed as young as ____ years old.

nine

