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.

[EX Q]: Photons have no mass and ____ electrical charge.
[EX A]: no

[EX Q]: Carbon is able to bond with up to ____ other elements.
[EX A]: four

[EX Q]: Cleavage is sometimes distinct in ____ directions forming rhombohedrons.
[EX A]:
three