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]: Beryllium has ____ protons and four electrons.
[A]: four


[Q]: Manatees swim ____ to six miles per hour.
[A]: two


[Q]: Polycarbonate lenses are ____ times more impact resistant than conventional plastic or glass lenses.
[A]:
ten