The police are now monitoring criminal/gang/drug 'activity' in the area.
There has been an increase in the city's (level of) economic 'activity'.
The instruments are used to detect volcanic 'activity' on the island.
(..) I was, uh... I was gonna go study in the business center. You don't need to. You're the smartest guy I've ever met. And besides... ...um, a rebellious group activity the day before competition is good for morale. Hmm? Um, well, I read that in a TED Talk, so... I... I heard it in a TED Talk. (..)2017 Spider-Man: Homecoming