―What    your English teacher doing now?  ―He _____ a newspaper.

 —______ your sister ______ in Greener China for a long time?—Yes.She joined it five years ago.

The train _______. Please get ready to get off.

---How dangerous! --- Yes. I think the policeman should stop the children      soccer in the street.

—It’s dangerous to swim here. Look at the sign!—Oh, I _______ it.