21. After the new technique was introduced, the factory produced ______ cars in 2009 as the year before.
__________strong earthquake struck __________ Yaan, Sichuan province on April 20, 2013.
―Hey, you haven’t been acting like yourself. Everything is OK? ―_________.
In this company, it is required that anyone who ______ recently come here _____ this kind of test.
I can’t believe that there are _____ many poor people in ____ a rich country.
You were stupid to try climbing up there. You ______ yourself.