---Look at those shoes, Mike! ---Wow! They look very cool, but I wonder ________.
—________? —He is of medium build and has a big nose.
Jim was seen ______ in the library from 3p.m. to 5p.m yesterday. He is often noticed _____ the library.
— Did you see Mr. Black just now? —Yes, He ___ his car when I met him.
--- Do you know the woman ____ is walking on the other side of the street? --- Oh, that’s my history teacher.
The air in Xuzhou is much worse than that in many other cities.We must do______to protect our environment.