Пре­об­ра­зуй­те, если это не­об­хо­ди­мо, слово CELEBRATE так, чтобы оно грам­ма­ти­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

Independence day is a public holiday. It __________________since July 4, 1776 when the thirteen colonies of America declared Independence from England. For many families this is the most important festival of the year.