Sentence:  Other THC activities followed , conducted by shopping centers , department stores , recreation equipment dealers , radio - TV stations , newspapers , and other organizations interested in the need existing to acquaint youngsters with the proper use of sporting firearms and the <WSD>development</WSD> of correct attitudes and appreciations related to hunting and wise use of our natural resources . 
Meaning of the word marked with <WSD> tags:  act of improving by expanding or enlarging or refining