( )—I can't find my ball,mum! —It's the door. A. of B. behind C. up
You can’t find_______ in such a small place.
China has the_______ population in the world.
I’m a new comer here, so I had a lot of problems_______ the bus stop.
How long has he_______the job?
—_______ have you been studying English?—Since 2002.