Вставь правильно артикли a or an ... man ... uniform ... bright student, ... educational programme, ... unusual invitation, ... loving parent, ... international exchange, ... well-known tower, ... excellent actor.

a man, a uniform, a bright student, an educational programme, an unusual invitation, a loving parent, an international exchange, a well-known tower, an excellent actor, an unpleasant incident, an apple, a black jacket, an accident, a nice girl, an optimistic person.