Choose the word or phrase among A, B, C or Dthat best fits the blank space in the following passage. Maple Tree Trees have (31) a meaningful role in the historical development of Canada and continue to be of commercial, environmental and aesthetic importanceto all Canadians. Maples contribute valuable wood products, keep the maple sugar industries alive and help to beautify the landscape. Since 1965 the maple leaf (32) the most important feature of the Nation Flag of Canada and the maple tree with the leaves has become the most well-known Canadian (33) , nationally and internationally. Maple leaf and badges are proudly (34) by Canadians abroad, and are recognized around are the world. (35) the maple leaf is closely associated with Canada, the maple tree was never officially recognized as Canada's emblem until 1996. 31. A. taken B. given C. done D. played 32. A. was B. have been C. has been D. is 33. A. sign B. symbol C. tree D. leaf 34. A. wear B. wore C. worn D. to be worn 35. A. Because B. So C. But D. Although giúp tớ với tớ cảm ơn