MY VOCAB PRACTICE.

1. Operate
   He was operating a huge system about virtual world.
2. Cooperation
   When you work with a team you need cooperation otherwise it's hard to handle everything by your own.
3. Inoperable
   It's better to take advantage and try to solve a health issue until it becomes inoperable.
4. Modus operandi
   There won't be any chance how to avoid the operation because it is needed and definitely a modus operandi.