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


[Q]: Raindrops produce ____ types of sound underwater.
[A]: two


[Q]: Many churches have ____ windows on each side of the nave, numbers some consider holy.
[A]:
seven