. However hard I tried to explain it to her, she just couldn’t understand. I found her impossible to .
They are forbidden _____, for they are still middle school students.
We have the most population in the world, most of it _____ farmers.
_____ at the back of the theatre, the girl couldn’t see ZhouJielun clearly.
The direction_____ which the president would go was kept a secret_____ safety concern.
It rained heavily in the south, _____ serious flooding in several provinces.