That Sun Yang won two gold medals in London Olympics is ______ to people all over China.

The two cities have reached an        to develop science and technology.

—Is that your mother?—No, she is my __________, my cousin’s mother.

Lee is new in Yangzhou. Maybe he needs a _____for sightseeing.

 —Tommy, you can never let others know what I have told you today.—Don’t worry. I will keep the ______.