   neutral   What is there in the air?     neutral   Some poisonous gas.  
    neutral   I can't believe that the air in this city is so dirty.     disgust   Yes. I think I won't come here again next time.  
    neutral   So do I.     disgust   
 It makes me sick at my stomach. 
 Why not clean it before we start to go?    happiness   Good idea. Let '