Greatly encouraged by what the teacher said, the boy returned to his seat, ____ to study harder.

Every Sunday morning I need an hour to enjoy my pleasant breakfast with ________ newspaper.

Our world ___________ to live in without so much pollution．

With all the novels he was interested in ___, he left the library and went back to his dorm.

I’m told that John had another car accident this morning.–I believe not. He _________so careless.