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.
![[RAPID GUNFIRE]
[RAPID GUNFIRE]](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
[RAPID GUNFIRE]
Breaking Bad Season 2, Episode 2

And plus you got a RAPID prototyper.
That's an expensive piece of equipment.
The Big Bang Theory Season 2, Episode 16

by the RAPID cooling
of magnesium and iron-rich lava?
The Big Bang Theory Season 12, Episode 2

-(GUN CLICKING)
-(RAPID TRILLING)
Westworld Season 2, Episode 10

No RAPID breathing,
no increase in perspiration.
The Big Bang Theory Season 1, Episode 10