To look forward to something means:

 When … … the doctor?

 New York is … then York.

 In some big cities people spend hours sitting in … … .

  strawberry jam;  
 traffic jams;
 traffic lights.

   Heavy traffic causes air … .

  pollution;
  population;
  prediction.

– Would you like to join our bicycle tour on weekend?
      –  I'm afraid I can't. … … on Sunday.  

 I'll play football;
I'm playing football;
I play football.

 … … your homework yet?

– What does John Smith do?
      –  He repairs cars. He … repairing them for 12 years.

   is; 
  was;
  his been.

  The Romans … that monumental building nearly 2000 years ago.  

 The Vikings … in wooden boats.