Many students didn’t realize the importance of study _______ they left school[]

The number of the children in the school ________ about three hundred. ________ of them________ from the countryside.

He makes about $1000 every week，much ______ is spent on books.

joy, Della first earned the trust of herstudents and then _____ of her colleagues.

Don’t park your car here, please. It’ll ________ the traffic.