This is a photo of the power station that _______ in my hometown.
He will come to call on you the moment he ____ his painting.
____ difficult the task may be, we will try our best to complete it in time.
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.