Although Tan Weiwei began her_______by singing in a local Ear, she is now a famous star.(成都市)

. School children must be taught how to deal with dangerous ________.

Mrs. Obama introduced the Let’s Move _______ yesterday. Its goal is to reduce children obesity(肥胖) today and in the future.

. It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.

 —Shall we go out for a walk? —Sorry. This is not the right _________ to invite me. I am too tired to walk.