The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
Dr. Smith, together with his wife and daughters, _____visit Beijing this summer.
What ____ pity that you couldn’t be there to receive _____ prize!
Television has many advantages. It keeps us___about the ___news and also provides entertainment in the house.
A significant proportion of such children are condemned______.
While typing, Helen has a habit of stopping _____ to give her long and flowing hair a smooth.