If his parents are convinced _____the fact that his son always focuses his mind _____his study.

They ______ the train to Beijing．Otherwise, they would have returned home．

don’t like ______________the teacher shouts at the Children so unlkindly.

nk everyone has a role to play inmaking the planet a better place.—Yes, indeed. ______.

If the university ________ such a good reputation, I would not have come here.