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.

Sometime during
the Clinton ADMINISTRATION,
Breaking Bad Season 2, Episode 8

That's the Drug Enforcement
Administration. The feds.
Breaking Bad Season 2, Episode 8

I'm with the
Drug Enforcement Administration.
Breaking Bad Season 2, Episode 2