doing        
            
        
    
    It is no use _____ to remember only grammar rules.
                It is no use \_\_\_\__ to remember only grammar rules.            
            
        Jim’s job is to keep his boss _____ of the latest development of that product in Europe.
                Jim’s job is to keep his boss \_\_\_\__ of the latest development of that product in Europe.            
            
        Mr. Jones enjoys _____ his children out from long walks.
                Mr. Jones enjoys \_\_\_\__ his children out from long walks.