Gun control is a subject ___ Americans have argued for a long time.
Now the number of the students in our school is ______ that of five years ago.
Seeing the tiger walking ______ them, the small animals ran ______ all directions.
I f you cheat in the exam, you will never______it.
It was a pity ______ John wouldnt be able to spend his vacation with me.
Our success depends ______ everyone works hard or not.