The heart is believed to _____blood into veins(血管) which are netted all over the body, thus keeping a person alive.
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.