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: Photons have no mass and ____ electrical charge.

A: no
****
Q: Brook stickleback have prominent mouths, large eyes and ____ to six spines on their backs.

A: four
****
Q: Echinoderms usually have ____ appendages, but there are some exceptions.

A:
five
****