The whole Chinese people will never forget the day, May 12th, 2008, _______ the strong earthquake happened in Wenchuan.
The professor referred to _____ yesterday.
He got completely _____ when he saw both Lucy and Lily, who are twin sisters.
--- Shall I open the window to let some fresh air in?--- No, _____
It ______ at the crossroads ______ he was killed in the accident the other day.
A good idea just ______ me — Let’s go swimming.