She keeps a supply of candles in the house in case of power _________.

Global warming caused by human being’s casual behaviour has become a major _______ for people all over the world.

Lucy is a girl of great musical _________, and I’m sure she will become a well-known musician sooner or later.

You must take everything into _____ when you want to do a difficult task.

You've missed your ____， and you will have to wait for the next round.