His story is __________ his own experience when he was studying in Harvard University.
He said that the key _____ to open the door had been lost.
I think you’ve got to the pointa change is needed, otherwise you will fail.
The small mountain villagewe spent our holiday two years ago lies in Hubei.
They went on well at first but eventually everything ______ they had worried about happened.
The police got to _________ was once an old yard_________ the workers used as a store.