Answer:
hook,, brook,, cook 
I hope that you have benefited
 
        
             
        
        
        
A four letter word for market or store is a shop
 
        
                    
             
        
        
        
I would say the correct answer is the native Americans' peaceful 9 months occupation of Alcatraz island.  
        
             
        
        
        
The prepositional phrase in the sentence given is:
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  "in the refrigerator" .
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Answer:
Object.
Explanation:
Visual aids are the mediums used alongside verbal descriptions to help in better understanding. Visual aids can be in different forms like graphs, video clips, charts, photographs, etc.
In the given scenario, the air conditioning manufacturing plant manager's desire to train the service installers will be best aided by the use of objects. This s because using objects will enable the trainees to be familiar with the parts and steps required for a successful installation.
Thus, the correct answer is an object.