The technology of electronic products is ________changing, so you needn’t follow the fashion.

          I got over from the failure of my entrance examination. And I made up my mind to devote myself to my study again.

Mother went shopping; ______, I cleaned the house.

I want to ring him＿＿＿to know the reason why he rang＿＿＿while I was speaking yesterday. 

_____, the fire was discovered soon after it broke out , otherwise it might cause much greater damage．