A dozen ideas were considered _____ the chief architect decided on the design of thebuilding.
The question _______ we can get enough coal for the winter has not been cleared up yet .
Every possible means ________ to prevent the air pollution , but the sky is still not clear.
Some people thought ________ possible to live on out space in the future .
_____his poor health ,he was still at work late into the night.
I don’t think that rock music is terrible , ______?