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

Skywalk is Chicago’s highest open-⁠air viewing area. It is 1,000 feet in the air! Everyone here can feel the strong wind and hear the dynamic buzz of the city below. The friendly staff will ______ tell the real story behind Chicago’s "Windy City" nickname.