The plant produces a (great/large/huge) 'mass of' blossoms every spring. = The plant produces 'masses of' blossoms every spring.
The mayor is trying to encourage more commuters to use 'mass transit' in order to alleviate traffic in the city.
His policies are supported by 'the' (great/broad) 'mass of' the people. [=by most of the people]
(..) Check out the environmental controls. It's a little warm in here. Isn't it amazing? This ship used to be a nuclear missile. An historical irony. Using an instrument of mass destruction to inaugurate an era of peace. A boyhood fantasy. I've seen this ship in the Smithsonian, (..)1996 Star Trek: First Contact