The adverb that tells when, where, and how is 'sometimes'.
        
                    
             
        
        
        
Answer: No commas need to go in that sentence. 
Explanation: 
 
        
             
        
        
        
North dekota, south dekota, texas, nevada, and washington 
        
             
        
        
        
Answer:
cluster light
Explanation:
Cluster light is known to be lights that are placed together in order to produce  luminous appearance and to beautify the place it is placed.
It can used on Christmas trees, fences windows, mantelpieces, etc. The given image is a cluster light which is used as traffic light and which gives direction to where one could take.
Cluster light is the correct answer.
 
        
             
        
        
        
If you want to explain to a foreigner how to learn when to use these words, you can say that  the go from more general to more specific (in: more general, at: more specific).
in: for objects inside other objects, or for location in a big context: year, country,
on: on top of other objects, or for location in middle-scale contexts: day, street
at: for location on a very small scale: moment (exact time), at specific address<span />