With a determiner: (1)-Have you seen Tom and Mary? -I haven't se

With a determiner:
(1)-Have you seen Tom and Mary? -I haven't seen ____ of them. (2)When you were in London, did you visit ____ Tower, too?
【正确答案】：either;the
【题目解析】：【考点点击】本题考查限定词。【要点透析 neither, either,both仅用于表述两者的情况,而any,all用于表述多者的情况,且 havent' seen either of them相当于 have seen neither of them而the Tower特指 The Tower of London(伦敦塔),故第二个空填the