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

Eventually, the idea of national parks caught on __________________ during the late 1800s and early 1900s. National parks now protect the world’s highest mountains, largest waterfalls, and other important features on nearly every continent.