— What’s wrong with you, sir? — My flight ______ ten minutes ago. What should I do?
I was so lucky that I met ______ European man on Three Gorges Square yesterday, and we had ______ happy conversation.
— Do you often speak English, Linlin? —No, I ______ English in public. What should I do?
The old man _____ for 10 years.
In English , she’s _____ writing than listening
—I feel tired and sleepy. —Why not stop _______ ?