https://online1.tingclass.net/lesson/shi0529/0000/458/340.mp3    
    https://image.tingclass.net/statics/js/2012
 
     
         
       
        Unit 340 
Why aren't you eating? 
I am on the diet. 
I am tasting/eating sth. 
icecream cone, drool 
She is drooling. 
To be on the diet; to go on the diet 
I'm on the diet for my health. 
Because I'm overweight, I decided to go on the diet.