下列语句所涉及到的人物依次是（ ）（1）何处招魂，香草还生三户地；当年呵壁，清湘应识九歌心。（2）诗史数千言，秋天一鹄先生骨；草堂三五里，春水群鸥野老心。（3）笔诤时政，心在苍生，万户争传新乐府；堤建西湖，神归东洛，千秋永祀老诗翁。（4）大明湖畔，趵突泉边，故居在垂杨深处；漱玉集中，金石录里，文采有后主遗风。

______ the problem, Tom has tried many different ways.

Is it true that Mike refused an offer from Yale University yesterday? — Yeah, but I have no idea _______ he did it; that’s one of his favorite universities.

_____ her children，she also has to look after her old parents.[ ]

Mr. Brown _______ his hometown since he _______the army.