IV. Choose the best option A, B, C or D to complete the sentences. 1. Since 1965, the maple tree with red leaves ______ the most well-known Canadian symbol.      A. has become      B. become                  C. became                  D. becoming 2. According to the schedule, the train __________ at 12 a.m.      A. arrived              B. arrive                     C. arrives                   D. arriving 3. The flight number 781 to Melbourne __________ at 9 o'clock tomorrow morning.      A. arrives              B. is arriving             C.has arrived             D.will arrive 4. Before my mother _____________ home, my father had prepared dinner.       A. came                B. come                      C. comes                    D. will come 5.The Louvre Museum ____from 9 a.m. to 6 p.m. every day except Tuesday and Wednesday.      A. opens                B. open                       C. will open               D. will be open