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.

Relax, he's just a friend. We're doing
an ORAL report together. He's really nice.
The Big Bang Theory Season 6, Episode 8

I'm sorry, what was that?
I had a little stroke after "ORAL."
The Big Bang Theory Season 6, Episode 8

And after that I'll make up my own rules
of ORAL hygiene...
The Big Bang Theory Season 6, Episode 21

is a brief ORAL narrative
The Big Bang Theory Season 7, Episode 12

It has also been shown to cause significantly
fewer side effects than other ORAL contraceptives.
The Big Bang Theory Season 8, Episode 4