The PLA soldiers came to the ruins of Yushu and after ______ seemed to be a long time, they helped some victims out.
The price of _______ bike will partly be determined by the sort of ______ material used.
Jumping out of _______ train running at a speed of 200 kilometers per hour is quite _____ dangerous practice.
---Are you satisfied with what the captain explained? ---Not at all. It couldn’t have been________.
In the USA, Columbus Day is_______ the _____ of Christopher Columbus in the New World.
According to the police, _______ some facts undiscovered.