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]
(..) trap you're laying for her. Are we? Laying any traps? If we want to create a new and better world, I'm not sure deceit and mass murder are the best ways to start. Which war was won without deceit and mass murder? Yes, you'll need to be ruthless if you're going to win the throne. (..)2017 TvShow: Game of Thrones Title: Beyond the Wall Season: 7 Episode 6