It was during the Ming Dynasty ________ the Great Wall was repaired and extended to take on the appearance it has today.
It was ____ that she couldn’t finish it by herself.
Weare watching TV ______ we caught sight of a friend of ours .
The price of diamond rings has risen sharply _______ the price of gold rings has gone down.
It is a long time since I last saw you . This sentence means _______
_______ reason you may give , you ought not to have left homework unfinished.