Capital
There is a lid covering all the mouths that are too small to feed themselves, forming the capital. All of the small mouths come together and create a place where everyone can support each other.
Picture the capital of your country. How many mouths have come together to support each other there? A thousand? A million? More?!
きょう
みやこ
None
To remember the reading きょう we use the Japanese city, Kyoto, which is spelled きょうと. It was once the capital of Japan! It was soooo full of mouths that came together that it was the capital for a long, long time.
When you think of the capital, think of きょうと!