Open the brackets and put the verbs in the proper tense and voice.
The Symbol of Canada
Canada’s vegetation (to be) rich and varied. But one Canadian tree (to become) the most prominent Canadian symbol. Its leaf (to find) in Canadian flag, coat-of-arms, coins, uniforms of Canadian athletes. This tree (to be) maple. Long before the first European settles (to come) there, Canada’s aboriginal peoples (to discover) the food properties of maple juice, which they (to gather) every spring. According to many historians, the maple leaf (to begin) to serve as a Canadian symbol as early as 1700.
Since 1965, the maple leaf (to be) the centerpiece of the National Flag of Canada and it (to become) the most prominent Canadian symbol, nationally and internationally. Maple leaf pins and badges proudly (to wear) by Canadians abroad, and (to recognize) around the world.