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.

Oh, yes, online gaming ADDICTION.
The Big Bang Theory Season 2, Episode 3

Did I tell you our lab got a grant
to study ADDICTION?
The Big Bang Theory Season 4, Episode 20

As the middle child, your ADDICTION
is rooted in your unmet need for attention.
The Big Bang Theory Season 1, Episode 10

I've been doing research on ADDICTION...
The Big Bang Theory Season 1, Episode 10

Not really.
Gambling ADDICTION is a sickness.
Breaking Bad Season 4, Episode 6