His house, for _______ he paid $10, 000, is now worth $50, 000.

.________, I have never seen anyone who’s as capable as John. 

I shall never forget the days ______ I stayed in Africa, ________ has brought me a lot of advantages.

 The notice came around two in the afternoon ________ the meeting would be postponed.(2012·江苏)

 Great changes have taken place in that school. It is no longer _______ it was 20 years ago, _______ it was so poorly equipped.