Answer:
cuz if children get exposed to the darknesses , only then will they know what it is all about and learn to defend themselves from it.
Explanation:
No improvement to this sentence is necessary. It makes perfect sense on its own and sounds right. "Either" always takes an "or" else the word wouldn't make sense, as it's meant to contrast binary options.
eg.
I'm either going to eat food or drink water.
T for true F for False :)