【答案解析】解析：desirable a.值得向往的，值得拥有的；好的，不错的，可取的(如：There are several desirable houses in this street. It is desirable for us to go there／that he should attend the conference．)(注意从句谓语用虚拟式)。desirous a.想要的，渴望的(desirous of／to+动词原形／that sb．do)。preferable(to)a.更可取的，更好的，更合意的。respectful(to)a.恭敬的，尊敬的。