.________ surprising it is you should not know what has happened!
The traffic is heavy these days, I arrive a bit late, so could you save me a place?
For a moment nothing happened. Then all shouting together.
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.
It was _____ he came back from Africa that year _________ he met the girl he would like to marry.
The way the guests ___ in the hotel influenced their evaluation of the service.