Saudi Arabia has planted the trees to keep the sand from __________ fertile areas．

The advantage of the new bridge will be the way it ____...

单项选择题The advantage of the new bridge will be the way it __________ the towns on the opposite banks of the river.

Mrs．Karnowsky has the __________ being the oldest perso...

单项选择题Mrs．Karnowsky has the __________ being the oldest person to graduate from this college．