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.

the 100-gigabit-per-second
BANDWIDTH gap
The Big Bang Theory Season 7, Episode 19

A little extra money to get
fractional T1 BANDWIDTH in the apartment?
The Big Bang Theory Season 1, Episode 1

hogging the BANDWIDTH
for your self-abuse.
The Big Bang Theory Season 5, Episode 2