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.

We're trying to BLEND in.
Game of Thrones Season 5, Episode 6

...an alien named Ford Prefect
pretended to be human in order to BLEND in...
The Big Bang Theory Season 8, Episode 8

Actually, I think
it's more of a wool-fire ant BLEND.
The Big Bang Theory Season 2, Episode 10

I don't wanna look like an idiot.
I wanna BLEND in.
The Big Bang Theory Season 3, Episode 6

they BLEND in.
Game of Thrones Season 5, Episode 2