Об­ра­зуй­те от слова DEMONSTRATE од­но­ко­рен­ное слово так, чтобы оно грам­ма­ти­че­ски и лек­си­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

He took the gum, which he had given the name Bubble Bubble, to the nearby grocery store and made a ______ to the salesmen to show the extraordinary features of his gum.