The research is so designed that once _______ nothing can be done to change it. 

 With a lot of difficult problems ____, the manager felt like a cat on hot bricks.

The Diaoyu Islands have been part of China’s territory since ancient times, __________ as important fishing grounds of Taiwan.

It’s said that Singapore is really a beautiful country. I’m considering _______ it.    

To make believe that there was still someone in the house, the housewife went downstairs, ______ the lights ______ in the living room.