What___wonderful world it would be if all countries in the world could live in___peace with one another.
____ 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.
We are 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 _______