used in response to a failure or mistake: dang, shoot, darn it

sister city

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

examination, exam, test / quiz

落ちる: to fall

to fall / (computing) to go down (as when a computer or application becomes unresponsive) / (electrical engineering, of a circuit breaker) to trip / (informal) to fail an examination

carelessness / negligence

油断大敵: there's many a slip twixt cup and lip, carelessness is what will get you into trouble; security is the greatest enemy; Idleness is the devil's workshop