No, it was not really voluntary if the animals did not volunteer than he/she would have their food rations reduced by half(or barley enough to survive off of). I don’t have a quote sorry
 
        
             
        
        
        
In 1647 by law. In the United states
        
                    
             
        
        
        
3. Andrea goes to her job,worked a full shift ,and then returned home to sleep
        
             
        
        
        
The preposition in question is "on", and its purpose is to show you where the dog chewed. You can remove the preposition to form the sentence "The brown dog chewed the rawhide bone." You can also rearrange it to find the preposition, "on the rawhide bone, the dog chewed" in what is commonly known as the Yoda technique.