regret not to have known somebody before

contrast finely with each other

vast difference(worlds apart)

a false alarm

say what one doesn't think(play a double game)

be laden with anxiety

on arrival at a new post

play favouritism and commit irregularities

be down-hearted(lose heart; be disheartened)

be utterly fatigued; mind and body

rarely known by the people

ashamed to associate with somebody

Joy colored one's cheeks.

good looks without substantical ability

investigate thoroughly

smite somebody with the tongue(venomously slander; make unfounded and malicious attacks)

feel nervous and creepy

with evil intent

be deeply alarmed

have a ready pen(write a composition without the need for a draft)