—Why can your neighbor know so much about London?—He ____ have been there before.

(2013·成都一诊)The chairman ________ hold office for five years according to the constitution.

When we were young, every evening my brother and I _____stay at home waiting for our mother to come back from work.

----Whose is that book? ----It _________ belong to Lucy. Her name is on it.

 It was very kind of you to do the washing-up but you _____ it