Complete the text adding prefixes, suffixes or both with the root words given in the parenthesis.

  Knowledge (a) (light) our mind. It enables a man to have (b) (master) over all forces of nature. There are so many wild beasts which are (c) (strong) than man. There are forces in nature such as (d) (light) and thunder, flood and earthquake etc. which can destroy a man and (e) (civil) in a moment. But a man rules over them all and makes them serve (f) (accord) to his wish. He makes use of the solar power to (g) (bright) the night. He is the (h) (conquer) of time and space. All discoveries and (i) (invent) are the results of (j) (know). It makes him (k) (doubt) the mightiest of all the (l) (create) in the universe. To maintain (m) (superior), man has to work (n) (through) his life.