The overseas Chinese scientist made another wonderful discovery, ___________ of great value to study AIDS.
There aren’t enough balls for ________; you have to share them.
In the early days of radio, those who reported the news were ________ to speak with standard dialects.
—— Jack, go and clean the blackboard. ——Why ______? I’m not on duty today.
More than one kind of English ________ all over the world.
The Wilsons lived in ________ A-shaped house in the mountain during _______ World War II.