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]
(..) ...by recently presented facts of biology. The virus has mutated. Into what? A new extraterrestrial biological entity. My God... The geometry of mass infection means we must re-evaluate their colonization. This isn't colonization. This is spontaneous repopulation. All our work... (..)1998 The X Files