What is【21】that a teacher most wants in his students? Attentiveness? A good memory? Diligence? Certainly these are the qualities commonly【22】with 'good students' in the【23】minD.And certainly, too, these are the qualities that most【24】to teachers' comfort. But the best students I ever had,【25】I remember the most wistfully, was a talkative, lazy day-dreamer. Sometimes he turned assignments in【26】, and a few he never【27】around to doing at all. Actually, my admiration for him was ironic,【28】I have never liked the name Ronald,【29】suggests to me the assumed name of a movie star. But he made one whole year of my【30】experience a delight. (56) A.there B.they C.it D.that