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]
(..) Vector has the girls. Go! What happened to the ship? It's big again! - Not as big as the moon is going to be! - What? The larger the mass of an object, the quicker the effects of the shrink ray wear off! I call it the Nefario Principle. I just came up with it now, actually. (..)2010 Despicable Me