Five firemen ________ escaped death when a staircase collapsed beneath their feet. 

He has made        progress that we all praise him．

As the idea of low-carbon life is now _____ accepted, more and more people travel by public transport.

He trained hard in puzzle-guessing, a sort of children’s game, all year, _____ still failed to reach his best form in all the tests given to both adults and children. 

It was ____ loud music that we couldn’t hear ourselves speak.