,__n__he_____I knew about this accident because it was kept as a secret
2,__e____Lily _____Lucy will go with you because one of them must be at home to
help her mother
3,____n__the black one_____the blue one is mine.Mine was borrowed by Li Lei
4,____e__Tuesday_____Wednesday is OK.I'll be free on these days
5,____n_he ______I know his address becaue he moved just a week ago
either...or..只否定一个,neither...nor.否定两者