After Queen Elizabeth officially opened the 2012 Summer Olympics, London became the first city ________ three Olympic Games in history.
-----Did Mary come to the party? ---I don’t know.She _____while I was out.
The old man leads ______happy life now, but he will never forget ______hard time when he was poor.
---I regret _____you John has been fired. ---I can hardly believe my ears.He’s such a fine worker.
---Alice, you look puzzled, Have you understood it? ---No.I _____another problem just now.
How pleased the detective was _____what his customer told him!