The Greens will have _______ holiday in China.
—Did you feel lonely when you worked in the west? —No, I have many hobbies, _____ when I kept a lot of pets then.
Mr. Black comes from England, and he has stayed in China for three years. So you can talk with him ________.
It is difficult for us to learn a lesson in life _______ we've actually had that lesson.
One fifth of the work _______ by computer last year.
This is the very thing ______ belongs _____.