可惜: it is a pity, what a pity, unfortunately...
诀别: to bid farewell, to part (usually with little hope of meeting again)...
期: a period of time, phase, stage, classifier for issues of a periodical, courses of study, time, term, period, to hope...
当即: at once, on the spot...
容光焕发: face glowing (idiom); looking radiant, all smiles...
乖: (of a child) obedient, well-behaved, clever, shrewd, alert, perverse, contrary to reason, irregular, abnormal...
容颜: mien, complexion...
致辞: to express in words or writing, to make a speech (esp. short introduction, vote of thanks, afterword, funeral homily etc), to address (an audience), same as...
燃油: fuel oil...
办学: to run a school...