|  | Bob wore a red
      helmet when riding his _________________ to school. | 
  
    |  | In the year
      1890, a comfortable way to ride was in a ________________. | 
  
    |  | A car can't make
      it up the mountain, so let's go on _________________. | 
  
    |  | The horses
      pulled the __________________ full of watermelons. | 
  
    |  | An good
      non-polluting type of transportation is a _________________. | 
  
    |  | The automobile
      exhaust caused the ______________ air pollution ever. | 
  
    |  | The 3 year old
      girl likes to pedal her _______________ down the road. | 
  
    |  | More children
      have asthma today since pollution is _________________. |