I think this is the most interesting thing _____ has happened to us .

My mother was cooking while I_________ the radio.

Quzhou is a wonderful place,visitors come here every year.

You don’t want to visit any other mountain if you have seen wu yue, but you won’t wish to see even wu yue_____________ returning from Mount Huangshan.[ ]

Elvis Presley has sold more than one______ records all his life.