It’s already 10’clock. I wonder how it ______ that she was two hours late on such a short trip.

We have never been to Mexico , what about Jeff —– _________. He hopes to visit it some day .

I don’t think ___ possible to travel aroundthe world without any modern equipment．

________is well known to all that Barack Obama will keep his promise___________he will remove the military forces from Iraq.

He wants to join the ____ club. He can ____ chess.