When she left the restaurant, she also left the young boy with a life lesson: You can tell a lot about a person ______ he or she treats the waiter.

A．in a way

B．by the way

C．in any way

D．on the way

Now the air in our hometown is even         than it was before. So we must do something to stop it.   [ ]

A. dirty                            

B. better    

C. worse                          

D. dirtiest