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.

Sorry, guys, but Secret Agent
Laser Obstacle Lunch is just stupid.
The Big Bang Theory Season 2, Episode 18

We get some girls over here
and play Laser Obstacle Strip Chess.
The Big Bang Theory Season 2, Episode 18

of an OBSTACLE course
that we design?
The Big Bang Theory Season 12, Episode 17

Too bad. You know the rules
of Secret Agent Laser Obstacle Chess.
The Big Bang Theory Season 2, Episode 18