The phrase "a very active one" is correct and usable in written English.
It can be used to describe something or someone that is characterized by high levels of activity or engagement.
Example: "In our community, the youth group is a very active one, organizing events and volunteering regularly."
Alternatives: "a highly active one" or "an extremely active one".
STEVE COLL: She's the Secretary of State and a very active one, so a large role.
Blue Origin hopes to fly people onboard its aircraft by early 2019, so expect next year to be a very active one for the company in terms of testing and preparations.
For anyone set on a Master's program, though, Kaufman offers strong advice: "Find a very active one".
In Mali, where local groups are very active, one of them, Sini Sanuman, just convinced one of the country's most important Islamic leaders to begin speaking out against it — a huge victory.
The participant is asked to report the percentage of time spent at different levels of activity (inactive, somewhat inactive, somewhat active and very active) on one weekday and one Saturday, and examples of the types of activities are given with the questionnaire.
Referring to the attitude to gay people of the Catholic church and Pope Benedict - the former cardinal Joseph Ratzinger - Guzzanti said: "In 20 years Ratzinger will be dead and will end up in hell, tormented by queer demons - not passive ones, but very active ones".
Small children, even the very active ones, usually love to read books.
After last week's lull, this week looks like it will be a very active and interesting one for Wall Street.
Our analysis of influential Twitter users and polarized communities regarding Brexit shows, on the one hand, a very active and organized Leave social media campaign, and on the other hand, a passive approach by the Remain side.
Our analysis of the influential users in the Brexit campaign shows, on the one hand, a very active and organized Leave social media campaign, and on the other hand, a passive approach used by the Remain side.
Paddle aside an actively calving glacier Sitting at the head of Aialik Bay is a dramatic ice-face named Aialik, a very active tidewater glacier that is one of the great draws in the park.
