--Our women athletes achieved great success in tile 2012 London Olympic Games.--Yes. No one else could perform ________, I think.

The door remained ____. I didn’t know where he had gone to .

A flag is _____ a piece of cloth. It stands for a nation’s people, their land and their history. 　 

 Mr. Smith,       with the       result of the experiment, sat on the chair, smiling.

It took________supplies to construct these energy­saving houses. It took brain too.