Don't _____ the news to the public until we give you the go-ahead (许可,准许).
There is a great deal of research ___that music activities engage different parts of the brain.
Teenagers have reached a point in their life_____they are supposed to make decisions of their own for the first time.
They are considering ____ the house before the prices go up.
_______ more about Participant Service of Expo 2010, Shanghai China, call Hotline +86-21-962010.
— Why did you leave that company?— I _______ a better position at IBM.