Long ago people knew very little about the world. The __A___ was thought to be flat. Hence , if a person ___B___ long enough in one direction, he would finally ___C___ the edge of the world and ______D____ off. Now we know the ___E_____.
Directions : (Question number 16-20) Fill in the blanks in the passage by selecting the most suitable word/phrase from given options.