The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

Somebody thought about
putting cheese in this CRUST.
The Big Bang Theory Season 11, Episode 13

I could explain the thermodynamics of
why the cheese seems hotter than the CRUST
The Big Bang Theory Season 10, Episode 13

Can I have tea with honey and
toast with the CRUST cut off?
The Big Bang Theory Season 5, Episode 6

You do understand
that CRUST doesn't normally
The Big Bang Theory Season 11, Episode 13

Just a CRUST of bread.
Game of Thrones Season 2, Episode 4