The railway_______Qinghai to Tibet is the longest plateau (高原) railway in the world.

He is quite sure that it’s __________impossible for him to fulfill the task within two days[ ]

I’m_____ than Jack, so I can carry this heavy box.

Two years has passed since I ______you thefirst time．

The U.S. official said North Korea — andIran — should follow in the steps of Libya, which last December said it wouldwork__________ to allow international weapons inspectors to do their work.