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.

in the Witness
Protection Program?
The Big Bang Theory Season 12, Episode 3

It's a little extra PROTECTION
for your investment.
Westworld Season 2, Episode 2

and PROTECTION in the light of the Seven.
Game of Thrones Season 3, Episode 9

What, like a witness PROTECTION
kind of thing?
Breaking Bad Season 4, Episode 4

I found Arya. She didn't want my PROTECTION.
Game of Thrones Season 5, Episode 1