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]: Body language is used when ____ words can express what the person is trying to communicate.
[A]: no


[Q]: Sexual maturity occurs at ____ to four years for females and four to five years for males.
[A]:
three