very, greatly

progress; improvements in social welfare. / Personal progress, usually in the development of a skill.

To improve (in reference to a society's technological capability or general quality of life). / To advance in proficiency; to make progress in the development of a skill.

contribution

to contribute

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

a piece of research, a study, investigation

to research, to study