21.  If there were no electric power .

22.  If there were no electric power, the world would go back to centuries ago.

23.  We should take full advantage of the limited electric power resources and not waste them.

24.  If there no electric power, the whole world will be beyond our imagine.

25.  We must realize the importance of electric power before we will haven't the source of electric power, otherwise, we are punished terriblely .

26.  People always say that knowledge is power and strenth .

27.  After all, one person's ability is limited, and frequently, we should depend on the collective power.

28.  Dad, Mum and i were having our supper around table when the lamp suddenly went out ---a power failure took place.

29.  Today, I will be sure to let you know my power.

30.  So I have power to advise them sth to do and not to .