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

[EX Q]: Compound objects have ____ representations themselves.
[EX A]: no

[EX Q]: Opium contains ____ family of alkaloids.
[EX A]:
two