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.

Yeah, I got a job
as a PHARMACEUTICAL sales rep.
The Big Bang Theory Season 8, Episode 21

...and satisfy your women
without PHARMACEUTICAL help.
The Big Bang Theory Season 3, Episode 6

Perfect for a PHARMACEUTICAL plant
or microchip factory
Breaking Bad Season 4, Episode 7

You know, I do work
at a PHARMACEUTICAL company.
The Big Bang Theory Season 7, Episode 13