People are using more and more natural gas, wind and other forms of _____.

The tragedy of the innocent young Brazilian boy killed by the British police has put the British police in a difficult________.

Mac’s still got a long       to go before he makes a manager.

Small ______ you are called early bird --- you always catch the first train to work!

In a time of social reform, people’s state of mind tends to keep _______ with the rapid changes of society.