As Chinese students， we must know something about a great man （51）c　　 Zheng He． He was a Ming Dynasty explorer． He led seven ocean journeys from 1405to 1433． At that time， the compass （52）p　　 an important role in his sailing． He even succeeded in sailing to the east coast of Africa． His last ocean journey was over half a （53）　　（世纪）earlier than Columbus' first journey to America． We Chinese are （54）　　 （骄傲的）of him． It's a pity that he died of illness on his way home from Africa in 1433． （55）H　　， his journeys were so meaningful in China's history．