N on n
The 'work' group
These nouns refer to work or action.
Recent research on molecular genetics supports this idea.
Tests on carpet samples taken from the flat have not been completed.
The transport minister said work on the $2.4 million project would begin this month and should be finished by December.
In the case of action, progress, research, and work, the preposition on is sometimes followed by an '-ing' clause.
action check operation progress research spot check test work
The MPs were 'dismayed' to see so little progress on closing down the power station.